iMac 21.5 inch mid 2011 running slow, help!

Question

Hello,I have an iMac 21.5 inch mid 2011 and it&#x27;s running very slow since I updated the mac to High Sierra. I don&#x27;t know, what&#x27;s the issue? I don&#x27;t know how to improve my mac, I&#x27;m not into those type of things. How can I improve the performance of my mac?Could someone help please?Thank you very much!!!EtreCheck version: 3.4.6 (460)Report generated 2018-01-12 21:53:25Download EtreCheck from https://etrecheck.comRuntime: 7:26Performance: Below AverageClick the [Lookup] links for more information from Apple Support Communities.Click the [Details] links for more information about that line.Click the [Clean up] link to delete unused files.Problem: Computer is too slowHardware Information: ⓘ    iMac (21.5-inch, Mid 2011)    [Technical Specifications] - [User Guide] - [Warranty &amp; Service]    iMac - model: iMac12,1    1 2,5 GHz Intel Core i5 (i5-2400S) CPU: 4-core    4 GB RAM Upgradeable - [Instructions]        BANK 0/DIMM0            2 GB DDR3 1333 MHz ok        BANK 1/DIMM0            2 GB DDR3 1333 MHz ok        BANK 0/DIMM1            Empty          BANK 1/DIMM1            Empty      Handoff/Airdrop2: not supported    Wireless:  en1: 802.11 a/b/g/nVideo Information: ⓘ    Intel HD Graphics 3000 - VRAM: 384 MB    AMD Radeon HD 6750M - VRAM: 512 MB        iMac 1920 x 1080Disk Information: ⓘ    ST3500418AS disk0: (500,11 GB) (Rotational)    [Show SMART report]        EFI (disk0s1 - MS-DOS FAT32) &lt;not mounted&gt;  [EFI]: 210 MB        Macintosh HD (disk0s2 - Journaled HFS+) /  [Startup]: 400.00 GB (183.71 GB free)        (disk0s3) &lt;not mounted&gt;  [Recovery]: 650 MB        BOOTCAMP (disk0s4 - NTFS) /Volumes/BOOTCAMP : 99.25 GB (66.61 GB free)    HL-DT-STDVDRW  GA32N  ()USB Information: ⓘ     USB20Bus        Apple Inc. FaceTime HD Camera (Built-in)         hub_device            Apple Inc. BRCM2046 Hub                Apple Inc. Bluetooth USB Host Controller     USB20Bus         hub_device            Apple Computer, Inc. IR Receiver            Apple Internal Memory Card ReaderThunderbolt Information: ⓘ    Apple Inc. thunderbolt_busSystem Software: ⓘ    macOS High Sierra  10.13.2 (17C88) - Time since boot: less than an hourConfiguration files: ⓘ    /etc/hosts - Count: 20Gatekeeper: ⓘ    Mac App Store and identified developersClean up: ⓘ    /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist        /Applications/Utilities/Adobe Creative Cloud/ACC/Creative Cloud.app/Contents/MacOS/Creative Cloud --showwindow&#x3D;false --onOSstartup&#x3D;true        Executable not found!    /Library/LaunchDaemons/gramblr.plist        /Applications/Gramblr.app/Contents/Resources/gramblr --listen        Executable not found!    ~/Library/LaunchAgents/com.jdibackup.ZipCloud.autostart.plist        open /Applications/ZipCloud.app/Contents/Resources/Utility.app -n --args 9 -l        Executable not found!    ~/Library/LaunchAgents/com.jdibackup.ZipCloud.notify.plist        open /Applications/ZipCloud.app/Contents/Resources/Utility.app --args 7 1        Executable not found!    4 orphan files found. [Clean up]Kernel Extensions: ⓘ        /Library/Extensions    [loaded]    com.Cycling74.driver.Soundflower (2.0b2 - SDK 10.10) [Lookup]        /System/Library/Extensions    [not loaded]    com.devguru.driver.SamsungComposite (1.4.32 - SDK 10.6) [Lookup]        /System/Library/Extensions/ssuddrv.kext/Contents/PlugIns    [not loaded]    com.devguru.driver.SamsungACMControl (1.4.32 - SDK 10.6) [Lookup]    [not loaded]    com.devguru.driver.SamsungACMData (1.4.32 - SDK 10.6) [Lookup]    [not loaded]    com.devguru.driver.SamsungMTP (1.4.32 - SDK 10.5) [Lookup]    [not loaded]    com.devguru.driver.SamsungSerial (1.4.32 - SDK 10.6) [Lookup]System Launch Agents: ⓘ    [not loaded]    9 Apple tasks    [loaded]    180 Apple tasks    [running]    101 Apple tasksSystem Launch Daemons: ⓘ    [not loaded]    36 Apple tasks    [loaded]    189 Apple tasks    [running]    107 Apple tasksLaunch Agents: ⓘ    [not loaded]    com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2016-06-19) [Lookup]    [failed]    com.adobe.AdobeCreativeCloud.plist (? faec172d 0 - installed 2016-02-23) [Lookup] - /Applications/Utilities/Adobe Creative Cloud/ACC/Creative Cloud.app/Contents/MacOS/Creative Cloud: Executable not found!    [loaded]    com.oracle.java.Java-Updater.plist (? 360a2b8d 72ac4dde - installed 2018-01-12) [Lookup]    [not loaded]    com.teamviewer.teamviewer.plist (TeamViewer GmbH - installed 2016-02-21) [Lookup]    [not loaded]    com.teamviewer.teamviewer_desktop.plist (TeamViewer GmbH - installed 2016-02-15) [Lookup]    [not loaded]    net.culater.SIMBL.Agent.plist (? 850e6250 c1512588 - installed 2013-06-29) [Lookup]Launch Daemons: ⓘ    [loaded]    com.BlueStacks.AppPlayer.bstservice_helper.plist (BlueStack Systems, Inc. - installed 2016-02-04) [Lookup]    [running]    com.adobe.adobeupdatedaemon.plist (Adobe Systems, Inc. - installed 2016-02-23) [Lookup]    [running]    com.adobe.agsservice.plist (Adobe Systems, Inc. - installed 2017-09-28) [Lookup]    [loaded]    com.adobe.fpsaud.plist (Adobe Systems, Inc. - installed 2017-12-15) [Lookup]    [loaded]    com.ea.origin.ESHelper.plist (Electronic Arts Inc. - installed 2015-02-15) [Lookup]    [loaded]    com.microsoft.office.licensing.helper.plist (? 6d8cb30e afb3bef0 - installed 2010-08-31) [Lookup]    [loaded]    com.microsoft.office.licensingV2.helper.plist (Microsoft Corporation - installed 2016-05-06) [Lookup]    [loaded]    com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-09-06) [Lookup]    [loaded]    com.teamviewer.Helper.plist (TeamViewer GmbH - installed 2016-02-15) [Lookup]    [not loaded]    com.teamviewer.teamviewer_service.plist (TeamViewer GmbH - installed 2016-02-21) [Lookup]    [failed]    gramblr.plist (? 57b1a936 0 - installed 2016-05-06) [Lookup] - /Applications/Gramblr.app/Contents/Resources/gramblr: Executable not found!User Launch Agents: ⓘ    [not loaded]    com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2016-06-19) [Lookup]    [loaded]    com.adobe.ARM.[...].plist (? c8cc50de 77b2808e - installed 2015-11-03) [Lookup]    [loaded]    com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.F2812EBA-4F83-4750-8EC0-69 3BCC7A5261.plist (Apple, Inc. - installed 2018-01-11)    [failed]    com.facebook.videochat.[redacted].plist (Apple, Inc. - installed 2018-01-11)    [loaded]    com.google.keystone.agent.plist (Google, Inc. - installed 2017-09-28) [Lookup]    [failed]    com.jdibackup.ZipCloud.autostart.plist (? c2b60ba9 0 - installed 2015-12-23) [Lookup] - /Applications/ZipCloud.app/Contents/Resources/Utility.app: Executable not found!    [failed]    com.jdibackup.ZipCloud.notify.plist (? 6c4d771f 0 - installed 2015-12-23) [Lookup] - /Applications/ZipCloud.app/Contents/Resources/Utility.app: Executable not found!    [running]    com.mackeeper.MacKeeper.Helper.plist (KROMTECH ALLIANCE CORP. - installed 2017-02-25) [Lookup]    [loaded]    com.macpaw.CleanMyMac.helperTool.plist (? 9de15a71 782e7ce8 - installed 2012-01-16) [Lookup]    [loaded]    com.macpaw.CleanMyMac.trashSizeWatcher.plist (? c7fb32df 782e7ce8 - installed 2012-01-16) [Lookup]    [loaded]    com.skype.skype.shareagent.plist (Skype Communications S.a.r.l - installed 2017-05-18) [Lookup]User Login Items: ⓘ    iTunesHelper    Programm (Apple, Inc. - installed 2018-01-11)        (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)    WeatherHDMenu    Programm (? 0 - installed 2015-03-01)        (/Applications/Weather HD.app/Contents/MacOS/WeatherHDMenu.app)    Android File Transfer Agent    Programm        (~/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)    fuspredownloader    Programm - Hidden        (~/Library/Application Support/.FUS/fuspredownloader.app)    Photo Stream URL    SMLoginItem - Hidden (Apple, Inc. - installed 2015-10-22)        (/Applications/iPhoto.app/Contents/Library/LoginItems/PhotoStreamAgent.app)Internet Plug-ins: ⓘ    JavaAppletPlugin: Java 8 Update 151 build 12 (installed 2018-01-12) Check version    Unity Web Player: UnityPlayer version 5.3.1f1 (installed 2015-12-23) [Lookup]    Flip4Mac WMV Plugin: 3.2.0.16   (installed 2013-03-29) [Lookup]    AdobeAAMDetect: AdobeAAMDetect 1.0.0.0 (installed 2016-06-19) [Lookup]    FlashPlayer-10.6: 28.0.0.137 (installed 2018-01-12) [Lookup]    Silverlight: 5.1.50901.0 (installed 2017-03-16) [Lookup]    QuickTime Plugin: 7.7.3 (installed 2017-12-01)    Flash Player: 28.0.0.137 (installed 2018-01-12) [Lookup]    zako: zako 1.0.0.0 (installed 2013-06-19) [Lookup]    SharePointBrowserPlugin: 14.1.3 (installed 2012-01-16) [Lookup]    AdobePDFViewer: 10.1.0 (installed 2012-01-16) [Lookup]    DirectorShockwave: 11.6.3r633 (installed 2011-10-28) [Lookup]3rd Party Preference Panes: ⓘ    Flash Player (installed 2017-12-15) [Lookup]    Flip4Mac WMV (installed 2013-03-29) [Lookup]    Java (installed 2018-01-12) [Lookup]Time Machine: ⓘ    Time Machine not configured!Top Processes by CPU: ⓘ         2%       WindowServer         2%       Finder         2%       plugin-container         1%       kernel_task         1%       firefoxTop Processes by Memory: ⓘ    604 MB        firefox    565 MB        kernel_task    311 MB        plugin-container    245 MB        mds_stores    117 MB        FinderTop Processes by Network Use: ⓘ    Input         Output        Process name    1006 KB       230 KB        firefox    33 KB         13 KB         mDNSResponder    4 KB          3 KB          apsd    714 B         490 B         netbiosd    0 B           64 B          SystemUIServerTop Processes by Energy Use: ⓘ     27.90    plugin-container     16.50    firefox     15.46    WindowServer      4.06    coreaudiodVirtual Memory Information: ⓘ    895 MB        Available RAM    17 MB         Free RAM    3.13 GB       Used RAM    878 MB        Cached files    5 MB          Swap UsedSoftware installs (last 30 days): ⓘ    Adobe Flash Player:  (installed 2018-01-12)    Java 8 Update 151:  (installed 2018-01-12)    Java 8 Update 151:  (installed 2018-01-12)    Install information may not be complete.Diagnostics Events (last 3 days for minor events): ⓘ    2018-01-12 21:12:02    SIMBL Agent.app Crash [Open]        Cause:        dyld: launch, running initializers        /usr/lib/libSystem.B.dylib    2018-01-11 23:56:46    System Preferences.app Hang [Open]    2018-01-11 21:54:03    Dock.app Crash [Open]        Cause:        abort() called        *** error for object 0x7fd85c310e78: incorrect checksum for freed object - object was probably modified after being freed.

rkaufmann87 · Accepted Answer

You have 2 major issues with your iMac.First, CleanMyMac is considered malware by most experienced users, this needs to be uninstall per the devleopers instructions.Second, when you got your iMac in 2011 4GB of RAM was a lot of RAM. However that was 7 years ago and 7 generations of Mac OS ago. Current versions of Mac OS require much more RAM. 8GB is considered the bare minimum to run current releases of Mac OS.  Your computer can accommodate up to 32GB of RAM and needs to be upgraded to 8GB or more. I strongly recommend that you do this using either Crucial RAM or OWC (www.macsales.com), the reason for recommending these companies if iMacs are sensitive to using quality RM and both vendor supply quality products at reasonable prices.Mac OS does not require ANY antivirus, cleaning or ANY third party "maintenance" applications, if simply kept up to date and otherwise left alone most users experience years of trouble free service.Good luck.