Q: El Capitan running slowly?

I updated to El Capitan from day one, and have had several issues related to mail ever since. Once in a while, my MBP would simply freeze up while mail was running, with no other option than to force a shutdown of the system. after reboot, launching mail would simply freeze everything up again.

The solution was to delete all logfiles from ~/Library/Containers/com.apple.mail/Data/Library/Logs/Mail/ as previosly suggested, after doing this, mail would behave normally again. Unfortunately this only lasted for a short period of time - after a few days (at best) same issue would occur all over.

I downloaded the 10.11.1 update last night, and so far everything mail-related seems to be running a bit more smooth - mail startup time is a bit faster, and haven't had any freezes since upgrading. Perhaps this update from Apple was the fix for my issues? Only time will tell...

I am not so sure that this is the case - I do not use Mac mail or Safari or i Cloud on any kind of regular basis. I have been monitoring the activity on my PC and even though I have never risen above 2.85 (out of 4) on my memory readings and never been over 45% CPU load the system still operates very slowly as compared to previously with X 6.8  I think that Mac has made some basic kind of blunder rather (not a IT expert but comparison shows: previous operation A1  present operation X 10)

Now what on Earth is THIS? I am just trying to perform the 10.11.1 update on an other computer, and instead of seeing the usual progress within the progress bar, the whole bar is kind of flashing like mad, and the checkbox on the right is intermittently switching from "Update" to "Cancel". There seems to be no way to stop this nonsense.

Please, Apple engineers, please return to the kind of quality we faithful users were accustomed to before El Capitan! Stop offering us countless gimmicks nobody really needs - we only want an OS that works, nothing else.

I agree the update this morning seems to have corrected the sluggish response on my iMac. However it has nothing to do with Office or any of the other issues I read here, I did al the email suggestions even though my email worked fine. No matter what I did it made no difference. So whatever it was that was making the OS so slow I will probably never know, however I have learned my lesson. From now on I will wait a considerable time before upgrading to make sure they have worked out all the bugs. I use this computer for work and can't have glitches like this while I work. If i wanted to work out glitches and try to figure out why things are moving slowly I would have kept my Windows PC.

I have also had a slow MBP since upgrading to El Capitan. I have downloaded ETRE and here are my results (but I'm not sure what to do next)

EtreCheck version: 2.6 (220)

Report generated 23/10/2015, 7:34 AM

Runtime 2:18

Download EtreCheck from http://etresoft.com/etrecheck

Click the [Click for support] links for help with non-Apple products.

Click the [Click for details] links for more information about that line.

Hardware Information: (What does this mean?)

    MacBook Pro (Retina, 15-inch, Early 2013)

    [Click for Technical Specifications]

    [Click for User Guide]

    MacBook Pro - model: MacBookPro10,1

    1 2.8 GHz Intel Core i7 CPU: 4-core

    16 GB RAM Not upgradeable

            BANK 0/DIMM0

            8 GB DDR3 1600 MHz ok

        BANK 1/DIMM0

            8 GB DDR3 1600 MHz ok

    Bluetooth: Good - Handoff/Airdrop2 supported

    Wireless:  en0: 802.11 a/b/g/n

    Battery: Health = Normal - Cycle count = 11 - SN = D863263Q078DNMHBQ

Video Information: (What does this mean?)

    Intel HD Graphics 4000

        Color LCD 2880 x 1800

    NVIDIA GeForce GT 650M - VRAM: 1024 MB

System Software: (What does this mean?)

    OS X El Capitan 10.11.1 (15B42) - Time since boot: about 17 hours

Disk Information: (What does this mean?)

    APPLE SSD SM768E disk0 : (751.28 GB) (Solid State - TRIM: Yes)

        EFI (disk0s1) <not mounted> : 210 MB

        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB

        Macintosh HD (disk1) / : 750.06 GB (248.18 GB free)

            Core Storage: disk0s2 750.42 GB Online

USB Information: (What does this mean?)

    LaCie LaCie DVDRW USB

    Apple Inc. FaceTime HD Camera (Built-in)

    Apple Inc. Apple Internal Keyboard / Trackpad

    Apple Inc. BRCM20702 Hub

        Apple Inc. Bluetooth USB Host Controller

    Seagate Expansion 1.5 TB

        EFI (disk2s1) <not mounted> : 210 MB

        BeUp (disk2s2) /Volumes/BeUp : 1.50 TB (824.80 GB free)

    Seagate Expansion Desk 2 TB

        EFI (disk3s1) <not mounted> : 315 MB

        Music (disk3s2) /Volumes/Music : 2.00 TB (999.06 GB free)

    Apple, Inc. Keyboard Hub

        Logitech USB Receiver

        Griffin Technology, Inc. Griffin PowerMate

        Apple, Inc Apple Keyboard

Thunderbolt Information: (What does this mean?)

    Apple Inc. thunderbolt_bus

Gatekeeper: (What does this mean?)

    Mac App Store and identified developers

Kernel Extensions: (What does this mean?)

        /Applications/FTP clients/Transmit.app

    [not loaded]    com.panic.TransmitDisk.transmitdiskfs (4.0.0 - SDK 10.5) [Click for support]

        /Applications/TechTool Pro 7.app

    [not loaded]    com.micromat.driver.spdKernel (1 - SDK 10.8) [Click for support]

    [not loaded]    com.micromat.driver.spdKernel-10-8 (1 - SDK 10.8) [Click for support]

        /Applications/Toast 14 Titanium/Toast Audio Assistant.app

    [not loaded]    com.Cycling74.driver.Soundflower (1.6.7 - SDK 10.7) [Click for support]

        /Applications/Utilities/DiskWarrior.app

    [not loaded]    com.alsoft.Preview (4.4) [Click for support]

        /Library/Extensions

    [loaded]    com.logitech.manager.kernel.driver (5.30.1 - SDK 10.8) [Click for support]

        /System/Library/Extensions

    [not loaded]    com.AmbrosiaSW.AudioSupport (4.1.2 - SDK 10.7) [Click for support]

    [not loaded]    com.Belcarra.iokit.USBLAN_netpart (3.1.1 - SDK 10.6) [Click for support]

    [not loaded]    com.Belcarra.iokit.USBLAN_usbpart (3.1.1 - SDK 10.6) [Click for support]

    [not loaded]    com.Logitech.Control Center.HID Driver (2.6.0) [Click for support]

    [not loaded]    com.RemoteControl.USBLAN.usbpart (3.1.1 - SDK 10.7) [Click for support]

    [not loaded]    com.ZTE.driver.ZTEUSBCDCACMControl (1.2.4) [Click for support]

    [not loaded]    com.ZTE.driver.ZTEUSBCDCACMData (1.2.4) [Click for support]

    [not loaded]    com.agfa.driver.AgfaUsbScanner (1.0.0b1) [Click for support]

    [loaded]    com.avira.kext.FileAccessControl (1.1.1 - SDK 10.9) [Click for support]

    [not loaded]    com.cleverandson.driver.XAerial (1.0.0) [Click for support]

    [not loaded]    com.gene.driver.genekext (2.4.1) [Click for support]

    [not loaded]    com.hzsystems.driver.CDSDAudioCaptureSupport (1.5) [Click for support]

    [not loaded]    com.logmein.hamachi (1.0) [Click for support]

    [not loaded]    com.markspace.iokit.IOMissingSyncMassStorage (199) [Click for support]

    [not loaded]    com.markspace.missingsync.palmos.classicseize (1) [Click for support]

    [not loaded]    com.microsoft.driver.MicrosoftMouse (6.0) [Click for support]

    [not loaded]    com.olympus.DSSBlockCommandsDevice (1.4.0) [Click for support]

    [not loaded]    com.palm.ClassicNotSeizeDriver (3.2.1) [Click for support]

    [not loaded]    com.wacom.kext.wacomtablet (6.1.7) [Click for support]

        /System/Library/Extensions/2.2.0/Belcarra.USBLAN_netpart.kext/Contents/Plug-Ins

    [not loaded]    com.belcarra.iokit.netpart.panther (1.6.3) [Click for support]

        /System/Library/Extensions/2.2.0/Belcarra.USBLAN_usbpart.kext/Contents/Plug-Ins

    [not loaded]    com.belcarra.iokit.usbpart.panther (1.6.3) [Click for support]

        /System/Library/Extensions/2.2.0/RemoteControl.USBLAN_usbpart.kext/Contents/Plu g-Ins

    [not loaded]    com.RemoteControl.USBLAN.panther (1.6.2) [Click for support]

        ~/Library/Services/ToastIt.service/Contents/MacOS

    [not loaded]    com.roxio.TDIXController (2.0) [Click for support]

Startup Items: (What does this mean?)

    AdobeVersionCueCS2: Path: /Library/StartupItems/AdobeVersionCueCS2

    MissingSyncMounting: Path: /Library/StartupItems/MissingSyncMounting

    NUDC: Path: /Library/StartupItems/NUDC

    ProTec6b: Path: /Library/StartupItems/ProTec6b

    ProTecVb: Path: /Library/StartupItems/ProTecVb

    Startup items are obsolete in OS X Yosemite

System Launch Agents: (What does this mean?)

    [loaded]    com.apple.java.InstallOnDemand.plist - Invalid signature!

Launch Agents: (What does this mean?)

    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]

    [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]

    [loaded]    com.avira.antivirus.general.agent.plist [Click for support]

    [loaded]    com.avira.antivirus.ipm.ui.plist [Click for support]

    [loaded]    com.avira.antivirus.notifications.agent.plist [Click for support]

    [loaded]    com.avira.antivirus.odscan.default.plist [Click for support]

    [loaded]    com.avira.antivirus.scheduler.agent.plist [Click for support]

    [running]    com.avira.antivirus.systray.plist [Click for support]

    [loaded]    com.avira.antivirus.telemetry.agent.plist [Click for support]

    [loaded]    com.avira.antivirus.update.default.plist [Click for support]

    [running]    com.avira.helper.avstats.plist [Click for support]

    [running]    com.epson.epw.agent.plist [Click for support]

    [loaded]    com.epson.esua.launcher.plist [Click for support]

    [loaded]    com.intego.backupassistant.agent.plist [Click for support]

    [running]    com.logitech.manager.daemon.plist [Click for support]

    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]

    [running]    com.wacom.wacomtablet.plist [Click for support]

Launch Daemons: (What does this mean?)

    [loaded]    com.adobe.SwitchBoard.plist [Click for support]

    [loaded]    com.adobe.versioncueCS3.plist [Click for support]

    [loaded]    com.ambrosiasw.ambrosiaaudiosupporthelper.daemon.plist [Click for support]

    [running]    com.atomicbird.macaroni.launchd.plist [Click for support]

    [failed]    com.avira.antivirus.dbcleaner.plist [Click for support] [Click for details]

    [loaded]    com.avira.antivirus.ipm.loader.plist [Click for support]

    [running]    com.avira.helper.watchdox.plist [Click for support]

    [loaded]    com.barebones.authd.plist [Click for support]

    [running]    com.freemacsoft.appcleanerd.plist [Click for support]

    [running]    com.intego.BackupAssistant.daemon.plist [Click for support]

    [loaded]    com.macpaw.CleanMyMac2.Agent.plist [Click for support]

    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]

    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]

    [loaded]    com.regularrateandrhythm.rowmotehelperaide.plist [Click for support]

    [running]    com.smithmicro.schedulerdaemon.plist [Click for support]

    [running]    de.appgineers.Mountain.Helper.plist [Click for support]

    [running]    net.decimus.synk.synkd.plist [Click for support]

    [failed]    org.ijbswa.privoxy.plist [Click for support]

User Launch Agents: (What does this mean?)

    [loaded]    com.adobe.ARM.[...].plist [Click for support]

    [loaded]    com.apple.SafariBookmarksSyncer.plist - Executable not found!

    [loaded]    com.bittorrent.uTorrent.plist [Click for support]

    [running]    com.c-command.SpamSieve.LaunchAgent.plist [Click for support]

    [loaded]    com.google.keystone.agent.plist [Click for support]

    [loaded]    com.littleknownsoftware.MailPluginTool-Startup.plist [Click for support]

    [loaded]    com.littleknownsoftware.MailPluginTool-Watcher.plist [Click for support]

    [loaded]    com.macpaw.CleanMyMac.helperTool.plist [Click for support]

    [loaded]    com.macpaw.CleanMyMac.trashSizeWatcher.plist [Click for support]

    [loaded]    com.macpaw.CleanMyMac2Helper.scheduledScan.plist [Click for support]

    [loaded]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist [Click for support]

    [loaded]    com.nchsoftware.switch.schedule.LikeSurvey.plist [Click for support]

    [failed]    com.spotify.webhelper.plist [Click for support]

    [loaded]    com.zeobit.MacKeeper.Helper [Click for support]

    [loaded]    uk.co.canimaansoftware.clamxav.freshclam.plist [Click for support]

User Login Items: (What does this mean?)

    Mountain    Application  (/Applications/Mountain.app)

    GrowlHelperApp    UNKNOWN  (missing value)

    Mobile Mouse Server    Application  (/Applications/Mobile Mouse Server.app)

    Fantastical    Application Hidden (/Applications/Fantastical.app)

    MicrosoftMouseHelper    Application  (/Applications/Microsoft Mouse.app/Contents/Resources/MicrosoftMouseHelper.app)

    FreeMemory    Application  (/Applications/FreeMemory.app)

    SpeechSynthesisServer    Application  (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks /SpeechSynthesis.framework/Versions/A/SpeechSynthesisServer.app)

    unDock    Application  (/Applications/unDock.app)

    CopyPaste Pro copy    Application  (/Applications/Clipboards/CopyPaste Pro copy.app)

    AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)

    Calendar    Application  (/Applications/Calendar.app)

    Rowmote Helper    UNKNOWN  (missing value)

    Dropbox    Application  (/Applications/Dropbox.app)

    SpamSieve    Application  (/Applications/SpamSieve.app)

    Firefox    Application  (/Applications/Firefox.app)

    XtraFinder    UNKNOWN  (missing value)

    AppCleaner Helper    Application  (/Applications/AppCleaner.app/Contents/Library/LoginItems/AppCleaner Helper.app)

    PopChar    Application  (/Applications/PopChar.app)

    PowerMate    Application  (/Applications/PowerMate.app)

    Spotify    UNKNOWN Hidden (missing value)

    apple-scc-20151014-111458    UNKNOWN  (missing value)

    Google Updater Helper    UNKNOWN  (missing value)

    ConnectService    Application  (/Library/Application Support/ArcSoft/Connect Service/ConnectService.app)

Other Apps: (What does this mean?)

    [running]    com.DanSchimpf.MacJournal.92832

    [loaded]    com.PeterHoerster.CopyPasteUniversal.59872

    [loaded]    com.ambrosiasw.SnapzLoginHelper

    [loaded]    com.apple.apple-scc.215072 - Invalid signature!

    [running]    com.apple.xpc.launchd.oneshot.0x1000000a.PowerMate

    [running]    com.apple.xpc.launchd.oneshot.0x1000000c.CopyPaste Pro

    [running]    com.apple.xpc.launchd.oneshot.0x1000000f.Snapz Pro X

    [running]    com.apple.xpc.launchd.oneshot.0x10000014.SpamSieve

    [running]    com.apple.xpc.launchd.oneshot.0x10000015.SpamSieveHelper

    [running]    com.apple.xpc.launchd.oneshot.0x10000017.EtreCheck

    [running]    com.flexibits.fantastical.72352

    [running]    com.flyingpaper.undock.136352

    [running]    com.freemacsoft.AppCleaner-Helper.53472

    [running]    com.getdropbox.dropbox.6112

    [running]    com.google.Chrome.202272

    [loaded]    com.griffintechnology.PowerMate.120992

    [running]    com.intego.virusbarrierexpress.agent

    [running]    com.macility.popchar3.119392

    [running]    com.microsoft.Excel.211232

    [running]    com.microsoft.Office365Service.101792

    [running]    com.microsoft.autoupdate.fba.19232

    [running]    com.microsoft.microsoftmousehelper.16992

    [running]    com.rockysandstudio.FreeMemory.76832

    [running]    com.rpatechnology.mobilemouse.104352

    [running]    com.wacom.TabletDriver.195552

    [running]    de.appgineers.Mountain.104672

    [loaded]    org.mozilla.firefox.82272

Internet Plug-ins: (What does this mean?)

    LogitechHarmony: Version: 1.0.0.1 [Click for support]

    WacomNetscape: Version: 1.1.1-1 [Click for support]

    Google Earth Web Plug-in: Version: 6.1 [Click for support]

    Default Browser: Version: 601 - SDK 10.11

    NP_2020Player_WEB: Version: 5.0.94.0 - SDK 10.6 [Click for support]

    RealPlayer Plugin: Version: Unknown

    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]

    QuickTime Plugin: Version: 7.7.3

    iPhotoPhotocast: Version: 7.0

    NP_2020Player_IKEA: Version: 5.0.94.1 - SDK 10.6 [Click for support]

    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]

    SharePointBrowserPlugin: Version: 14.5.7 - SDK 10.6 [Click for support]

    JavaAppletPlugin: Version: Java 8 Update 60 build 27 Check version

User internet Plug-ins: (What does this mean?)

    Picasa: Version: 1.0 [Click for support]

Safari Extensions: (What does this mean?)

    iMedia Converter Deluxe 

    Disconnect

User Audio Plug-ins: (What does this mean?)

    iSightAudio: Version: 6.4

3rd Party Preference Panes: (What does this mean?)

    Adobe Version Cue CS3  [Click for support]

    Déjà Vu  [Click for support]

    Growl  [Click for support]

    Java  [Click for support]

    Logitech Control Center  [Click for support]

    Logi Options Launcher  [Click for support]

    Macaroni  [Click for support]

    MenuMeters  [Click for support]

    Microsoft Mouse

    SneakPeek Photo  [Click for support]

    Suitcase Fusion 2 Core  [Click for support]

Time Machine: (What does this mean?)

    Skip System Files: NO

    Mobile backups: ON

    Auto backup: YES

    Volumes being backed up:

        Macintosh HD: Disk size: 750.06 GB Disk used: 501.88 GB

    Destinations:

        B:UP_1.5 [Local]

        Total size: 1.50 TB

        Total number of backups: 51

        Oldest backup: 2/07/2015, 1:53 AM

        Last backup: 23/10/2015, 6:43 AM

        Size of backup disk: Too small

            Backup size 1.50 TB < (Disk used 501.88 GB X 3)

        Time Machine 3TB [Local]

        Total size: 3.00 TB

        Total number of backups: 102

        Oldest backup: 24/03/2013, 7:11 AM

        Last backup: 21/10/2015, 7:03 PM

        Size of backup disk: Excellent

            Backup size 3.00 TB > (Disk size 750.06 GB X 3)

        Time Machine Backups [Local]

        Total size: 749.11 GB

        Total number of backups: 44

        Oldest backup: 21/02/2015, 8:35 AM

        Last backup: 1/06/2015, 2:16 PM

        Size of backup disk: Too small

            Backup size 749.11 GB < (Disk used 501.88 GB X 3)

Top Processes by CPU: (What does this mean?)

       100%    Mountain

         5%    launchservicesd

         3%    Google Chrome Helper(7)

         1%    WindowServer

         1%    Mail

Top Processes by Memory: (What does this mean?)

    1.76 GB    Google Chrome Helper(7)

    1.22 GB    kernel_task

    508 MB    WindowServer

    442 MB    softwareupdated

    377 MB    mdworker(19)

Virtual Memory Information: (What does this mean?)

    661 MB    Free RAM

    15.00 GB    Used RAM (5.40 GB Cached)

    0 B    Swap Used

Diagnostics Information: (What does this mean?)

    Oct 23, 2015, 07:32:18 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073218_[redacted].crash

    Oct 23, 2015, 07:32:16 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073216_[redacted].crash

    Oct 23, 2015, 07:32:05 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073205_[redacted].crash

    Oct 23, 2015, 07:31:46 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073146_[redacted].crash

    Oct 23, 2015, 07:31:36 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073136_[redacted].crash

    Oct 23, 2015, 07:31:34 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073134_[redacted].crash

    Oct 23, 2015, 07:31:24 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073124_[redacted].crash

    Oct 23, 2015, 07:31:05 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073105_[redacted].crash

    Oct 23, 2015, 07:30:55 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073055_[redacted].crash

    Oct 23, 2015, 07:30:53 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073053_[redacted].crash

    Oct 23, 2015, 07:30:36 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073036_[redacted].crash

    Oct 23, 2015, 07:30:26 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073026_[redacted].crash

    Oct 23, 2015, 07:30:24 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073024_[redacted].crash

    Oct 23, 2015, 07:30:06 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-073006_[redacted].crash

    Oct 23, 2015, 07:29:55 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072955_[redacted].crash

    Oct 23, 2015, 07:29:53 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072953_[redacted].crash

    Oct 23, 2015, 07:29:44 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072944_[redacted].crash

    Oct 23, 2015, 07:29:26 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072926_[redacted].crash

    Oct 23, 2015, 07:29:16 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072916_[redacted].crash

    Oct 23, 2015, 07:29:14 AM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-23-072914_[redacted].crash

    Oct 22, 2015, 02:07:48 PM    /Library/Logs/DiagnosticReports/Mountain_2015-10-22-140748_[redacted].cpu_resou rce.diag [Click for details]

    Oct 22, 2015, 02:01:33 PM    Self test - passed

    Oct 22, 2015, 01:50:40 PM    ~/Library/Logs/DiagnosticReports/UnmountAssistantAgent_2015-10-22-135040_[redac ted].crash

    Oct 22, 2015, 01:41:09 PM    /Library/Logs/DiagnosticReports/Mountain_2015-10-22-134109_[redacted].cpu_resou rce.diag [Click for details]

    Oct 22, 2015, 08:06:23 AM    /Library/Logs/DiagnosticReports/softwareupdated_2015-10-22-080623_[redacted].cr ash

    Oct 21, 2015, 11:30:14 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-233014_[redacted].crash

    Oct 21, 2015, 11:30:10 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-233010_[redacted].crash

    Oct 21, 2015, 11:29:59 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-232959_[redacted].crash

    Oct 21, 2015, 11:29:52 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-232952_[redacted].crash

    Oct 21, 2015, 11:00:04 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-230004_[redacted].crash

    Oct 21, 2015, 11:00:01 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-230001_[redacted].crash

    Oct 21, 2015, 10:59:16 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225916_[redacted].crash

    Oct 21, 2015, 10:58:49 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225849_[redacted].crash

    Oct 21, 2015, 10:58:39 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225839_[redacted].crash

    Oct 21, 2015, 10:58:37 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225837_[redacted].crash

    Oct 21, 2015, 10:58:19 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225819_[redacted].crash

    Oct 21, 2015, 10:58:09 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225809_[redacted].crash

    Oct 21, 2015, 10:58:06 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225806_[redacted].crash

    Oct 21, 2015, 10:57:57 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225757_[redacted].crash

    Oct 21, 2015, 10:57:39 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225739_[redacted].crash

    Oct 21, 2015, 10:57:29 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225729_[redacted].crash

    Oct 21, 2015, 10:57:27 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225727_[redacted].crash

    Oct 21, 2015, 10:57:16 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225716_[redacted].crash

    Oct 21, 2015, 10:57:08 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225708_[redacted].crash

    Oct 21, 2015, 10:56:26 PM    /Library/Logs/DiagnosticReports/avlogwriter_2015-10-21-225626_[redacted].crash

    Oct 20, 2015, 10:15:26 PM    /Library/Logs/DiagnosticReports/Mail_2015-10-20-221526_[redacted].hang

    Oct 20, 2015, 10:15:22 PM    /Library/Logs/DiagnosticReports/iTunes_2015-10-20-221522_[redacted].hang

    Oct 20, 2015, 10:13:45 PM    /Library/Logs/DiagnosticReports/Safari_2015-10-20-221345_[redacted].hang

    Oct 20, 2015, 10:13:44 PM    /Library/Logs/DiagnosticReports/firefox_2015-10-20-221344_[redacted].hang

Start by getting rid of Avira, which is doing nothing for you but crashing.

Frankly, that Mac is an unmitigated disaster of ill-conceived and useless "anti-virus" and "cleaning" garbage, far too many to enumerate. If you want help, post a new Discussion. The answer will be to erase and reconfigure that Mac.

Thanks, I will trash AVIRA and see if that helps. I admit to having lots of "Clean-up" apps on my computer as the spinning ball has been driving me crazy. Appreciate your help.

Those sorts of apps don't solve problems, they cause them.

The answers to your Mac's performance problems can be found all over this site, but if you want personal attention the best way to get it is to start your own Discussion. It's just the way this site works.

Same issue on a MacMini.  I have two MacLaptops that I updated to El Cap with no problems.  But my MacMini was incredibly slow, particularly trying to stream video or listen to iTunes radio.  Not running or using Mail app or iCloud.  No obvious memory or CPU hogs in Activity Monitor.  Uninstalled and reinstalled Flash without improvement.  Zapped PRAM.  Did several other "fixes" suggested in this thread.  All with no-joy.

What ultimately fixed it for me was downloading and running the latest version of the Cocktail app for El Cap, followed by a reboot.  http://www.maintain.se/cocktail/

I've been a long time user of this software with very good luck.  You can try it for free, but worth the modest price IMHO!

I installed El Capitan last night , today i reinstalled it again and still running very slow , My iMac is responding very slow when i open Safari i see the wheel turning and after half a minute Safari opens and then if i type anything in the search the same problem persists. Not sure if Apple have to fix some bugs to make it wired better as my previous operating system.

any suggestions will be apricaiated.

I finally got up the courage to upgrade my Retina 13"MacBook Pro to El capital last night. I prepped the SSD, optimizing the drive, testing for corruption, repairing disk permissions, using Cocktail to clear all the caches and log files, etc. My Mac has a ton of 3rd party stuff on it going back a few generations so I was expecting problems. Surprisingly, my laptop is now running much faster than before and is much more responsive. I have had to upgrade a lot of older software and ran into some issues where I had to sift through the Library folder, deleting obsolete files, etc. But error messages would appear that led me to the location of the faulty files. And now it's blazing fast. It's easy to find bugs, though. Like trying to create and name folders in Launchpad. Even with the folder title nicely selected, typing had no effect. But so far, so good... every new system has bugs. By the time we reach 10.11.4 or.5, it should be pretty much bug free.

I do think it helped that I prepped the SSD and upgraded most software BEFORE I downloaded and installed El Capitan

Correction: It did last...

Autocorrect... It DID NOT last

I had exactly the same issue of the flashing progress bar. I called Apple support and they fixed it via screen sharing and trashing some preference files and after a restart , it was all OK,

I asked if it had been a common issue but they declined to answer. At least it was sorted quickly.

Thats the trick cheers!