MacBook Pro very slow but CPU running normal

This is the problem:
My mac is running very slow lately. It is most annoying when writing text in emails, chats or Word. Beachballs comes up very often, switching between programms might also take some time. Sometimes hot coners need a very long time to react.

My CPU is not busy at all. Most of the times Activity Monitor says it 70-90% idle.

Same for Memory:

About my mac:
MacBook Pro 13" (Late 2011), El Capitan 10.11.6, Processor: 2,4 GHz Intel Core i5, Memory: 8 GB 1067 MHz DDR3, Startup Disk: SSD Samsung 500GB
For more see the detailed EtreCheck report below

What I have already done

• Removed data from my hard disks. I have one SSD on which the system is on and one HDD for my data. The SSD has around 20% free now.
• Did the hardware test: Everythings is fine.
• Reset SMC and NVRAM / PRAM
• Cleaned my desktop
• Did run Disk Utility's First Aid
• Replaced my battery with a new one. The old was on "Replace Soon"
• Did run the EtreCheck (report below)

What I am thinking of doing next:

• Upgrade to High Sierra even though I am not sure if this could at all
• Reinstalling my OS from scratch

Any idea why my mac is so slow? What could make sense to do?

Here is my EtreCheck report:
(I have two things explained about this below the report)

EtreCheck version: 4.1 (4A162)

Report generated: 2018-03-06 14:14:45

Download EtreCheck from https://etrecheck.com

Runtime: 5:42

Performance: Below Average

Problem: Computer is too slow

Description:

Its most annoying when i write it appears delayed. Also switching between programs takes longer than usually.

Interestingly I could stream and watch HD videos in my browser without a problem.

Major Issues:

Anything that appears on this list needs immediate attention.

Adware - Adware detected.

Minor Issues:

These issues do not need immediate attention but they may indicate future problems.

Clean up - There are orphan files that could be removed.

Unsigned files - There is unsigned software installed. It appears to be legitimate but should be reviewed.

System modifications - There are a large number of system modifications running in the background.

Low performance - EtreCheck report took over 5 minutes to run. This is unusual.

Hardware Information:

MacBook Pro (13-inch, Late 2011)

MacBook Pro Model: MacBookPro8,1

1 2,4 GHz Intel Core i5 (i5-2435M) CPU: 2-core

8 RAM Upgradeable

BANK 0/DIMM0

4 GB DDR3 1067 ok

BANK 1/DIMM0

4 GB DDR3 1067 ok

Battery: Health = Normal - Cycle count = 1

Video Information:

Intel HD Graphics 3000 - VRAM: 512 MB

Color LCD 1280 x 800

AL1716 1280 x 1024 @ 60 Hz

Drives:

disk0 - Samsung SSD 850 EVO 500GB 500.11 GB (Solid State - TRIM: No)

Internal SATA 6 Gigabit Serial ATA

disk0s1 - EFI [EFI] 210 MB

disk0s2 - U******d [Core Storage Container] 499.25 GB

disk1 - S***************B (Journaled HFS+) 498.91 GB

disk0s3 - Recovery HD [Recovery] 650 MB

disk2 - ST1000LM024 HN-M101MBB 1.00 TB (Mechanical)

Internal SATA 6 Gigabit Serial ATA

disk2s1 - EFI [EFI] 210 MB

disk2s2 - H*****B (Journaled HFS+) 999.86 GB

Mounted Volumes:

disk1 - S***************B 498.91 GB (107.36 GB free)

Journaled HFS+

Mount point: /

Encrypted

disk2s2 - H*****B 999.86 GB (114.41 GB free)

Journaled HFS+

Mount point: /Volumes/HDD-1TB

Network:

Interface en0: Ethernet

Interface fw0: FireWire

Interface en1: Wi-Fi

802.11 a/b/g/n

One IPv4 address

Interface en4: iPhone

Interface en3: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

System Software:

OS X El Capitan 10.11.6 (15G19009)

Time since boot: Less than an hour

System Load: 2.45 (1 min ago) 1.97 (5 min ago) 2.03 (15 min ago)

Configuration Files:

/etc/hosts - Count: 6

Security:

System Status

Gatekeeper Mac App Store and identified developers

System Integrity Protection Enabled

Adware:

Safari Extension:

Reason: Adware name match

Safari Extension:

Reason: Adware name match

Unsigned Files:

Launchd: /Library/LaunchDaemons/com.adobe.SwitchBoard.plist

Executable: /Library/Application Support/Adobe/SwitchBoard/SwitchBoard.app/Contents/MacOS/launch.switchboard

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.init.plist

Executable: /Library/Application Support/Avast/hub/init.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.uninstall.plist

Executable: /Library/Application Support/Avast/hub/autouninstall.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/org.gpgtools.macgpg2.shutdown-gpg-agent.plist

Executable: /usr/local/MacGPG2/libexec/shutdown-gpg-agent

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.sierrawireless.SwitchTool.plist

Executable: /Library/Sierra/SierraDevSupport

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.update.plist

Executable: /Library/Application Support/Avast/components/update/update.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/org.gpgtools.gpgmail.enable-bundles.plist

Executable: /Library/Application Support/GPGTools/uuid-patcher enable-bundles

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/com.avast.userinit.plist

Executable: /Library/Application Support/Avast/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: ~/Library/LaunchAgents/com.avast.home.userinit.plist

Executable: ~/Library/Application Support/Avast/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/org.gpgtools.gpgmail.patch-uuid-user.plist

Executable: /Library/Application Support/GPGTools/uuid-patcher

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/gramblr.plist

Executable: /Applications/Gramblr.app/Contents/Resources/gramblr --listen

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist

Executable: /Library/PrivilegedHelperTools/com.microsoft.office.licensing.helper

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/org.gpgtools.gpgmail.patch-uuid.plist

Executable: /Library/Application Support/GPGTools/uuid-patcher

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/org.gpgtools.macgpg2.fix.plist

Executable: /usr/local/MacGPG2/libexec/fixGpgHome

Details: Exact match found in the whitelist - probably OK

Kernel Extensions:

/Library/Application Support/Avast/components/fileshield/signed

[Loaded] AvastFileShield.kext (4.0.0 - SDK 10.12)

/Library/Application Support/Avast/components/proxy/signed

[Loaded] AvastPacketForwarder.kext (2.1 - SDK 10.12)

/Library/Extensions

[Not Loaded] PGPdiskDriver.kext (9.9.0.397)

[Not Loaded] PGPnke.kext (9.9.0.397)

/Library/StartupItems/ArcanaStartupSound/Resources

[Not Loaded] ArcanaPRAM.kext (1.1b3)

/System/Library/Extensions

[Not Loaded] ApowersoftAudioDevice.kext (1.0.0d1 - SDK 10.6)

[Not Loaded] Soundflower.kext (1.5.1)

[Not Loaded] ZTEUSBCDCACMData.kext (ZTEDriver_MacV1.3.13)

[Not Loaded] ZTEUSBMassStorageFilter.kext (ZTEDriver_MacV1.3.13)

[Not Loaded] NovatelWirelessWWAN.kext (v3.0.23 (001))

[Not Loaded] OptionHS.kext (3.31.0)

[Not Loaded] OptionMSD.kext (1.22.0)

[Not Loaded] PGPwde.kext (9.9.0.397)

[Not Loaded] SierraDIPSupport.kext (1.0.0.7)

[Not Loaded] SierraFSRSupport.kext (3.0.0.2)

[Not Loaded] SierraHSRSupport.kext (3.0.0.14)

[Not Loaded] SierraIPDirect.kext (1.1.4)

/System/Library/Extensions/NovatelWirelessWWAN.kext/Contents/Plugins

[Not Loaded] NovatelWirelessUSBCDCECMControl.kext (v3.0.23 (001))

[Not Loaded] NovatelWirelessUSBCDCECMData.kext (v3.0.23 (001))

[Not Loaded] NovatelWireless3G.kext (v3.0.23 (001))

[Not Loaded] NovatelWireless3GData.kext (v3.0.23 (001))

[Not Loaded] NovatelWirelessFilter.kext (v3.0.23 (001))

[Not Loaded] NovatelWirelessViaBusEnum.kext (v3.0.23 (001))

Startup Items:

ArcanaStartupSound Path: /Library/StartupItems/ArcanaStartupSound

HWNetMgr Path: /Library/StartupItems/HWNetMgr

HWPortDetect Path: /Library/StartupItems/HWPortDetect

MobileBrServ Path: /Library/StartupItems/MobileBrServ

System Launch Agents:

[Not Loaded] 7 Apple tasks

[Loaded] 153 Apple tasks

[Running] 80 Apple tasks

System Launch Daemons:

[Not Loaded] 44 Apple tasks

[Loaded] 149 Apple tasks

[Running] 98 Apple tasks

[Other] One Apple task

Launch Agents:

[Loaded] org.gpgtools.gpgmail.patch-uuid-user.plist (? 84ce07f2 - installed 2015-09-21)

[Running] org.gpgtools.Libmacgpg.xpc.plist (? 6dacf738 - installed 2016-06-28)

[Running] org.gpgtools.macgpg2.shutdown-gpg-agent.plist (? df7bd0cf - installed 2016-06-28)

[Loaded] de.devolo.networkservice.notify.plist (? 71d7c587 - installed 2017-03-19)

[Loaded] com.avast.userinit.plist (? bb25154c - installed 2017-12-21)

[Not Loaded] com.adobe.AAM.Updater-1.0.plist (? ffb65062 - installed 2016-08-10)

[Loaded] org.gpgtools.gpgmail.enable-bundles.plist (? d032aea - installed 2015-09-21)

[Running] com.avast.update-agent.plist (AVAST Software a.s. - installed 2017-12-21)

[Other] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a 23d420d.plist (Adobe Systems, Inc. - installed 2018-02-14)

[Other] com.brother.LOGINserver.plist (? a1772de2 - installed 2011-09-22)

[Loaded] org.gpgtools.macgpg2.fix.plist (? d7ac5146 - installed 2016-06-28)

[Loaded] org.gpgtools.updater.plist (? 758f8417 - installed 2016-07-05)

Launch Daemons:

[Loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2018-02-14)

[Running] com.sierrawireless.SwitchTool.plist (? f4fe8c02 - installed 2010-10-22)

[Loaded] org.gpgtools.gpgmail.patch-uuid.plist (? 42fc83f8 - installed 2015-09-21)

[Running] de.devolo.networkservice.plist (? ce536d47 - installed 2017-03-19)

[Loaded] com.apple.aelwriter.plist (Apple, Inc. - installed 2012-05-23)

[Running] gramblr.plist (? 57b1a936 - installed 2018-02-11)

[Running] com.apple.qmaster.qmasterd.plist (Apple, Inc. - installed 2010-08-26)

[Loaded] com.avast.uninstall.plist (? 22f94791 - installed 2017-12-21)

[Loaded] com.avast.init.plist (? fc55b6fa - installed 2017-12-21)

[Loaded] com.adobe.SwitchBoard.plist (? 856489a3 - installed 2011-11-01)

[Loaded] com.adobe.fpsaud.plist (Adobe Systems, Inc. - installed 2018-02-02)

[Loaded] com.microsoft.office.licensing.helper.plist (? 6d8cb30e - installed 2010-08-31)

[Loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2018-02-14)

[Running] com.avast.update.plist (? 5c6ac355 - installed 2017-12-21)

User Launch Agents:

[Running] com.spotify.webhelper.plist (Spotify - installed 2018-01-11)

[Other] com.google.keystone.agent.plist (Google, Inc. - installed 2017-09-28)

[Loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-10)

[Loaded] com.avast.home.userinit.plist (? 0 - installed 2017-12-21)

[Loaded] com.adobe.ARM.df0ab5bbe6f698196fcc21e3c1e66dcb758bd911f4d637272d9d8109.plist (? 0 - installed 2015-09-24)

[Other] com.wondershare.mobilegodaemon.plist (? 0 - installed 2014-04-21)

[Loaded] com.skype.skype.shareagent.plist (Skype Communications S.a.r.l - installed 2017-10-02)

[Loaded] com.adobe.AAM.Updater-1.0.plist (? 0 - installed 2016-08-10)

User Login Items:

Android File Transfer Agent Application

(~/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)

Dropbox Application (Dropbox, Inc.

(/Applications/Dropbox.app)

WunderlistHelper SMLoginItem (Mac App Store - installed 2017-07-17)

(/Applications/Wunderlist.app/Contents/Library/LoginItems/WunderlistHelper.app)

CopyClipHelper SMLoginItem (Mac App Store - installed 2016-12-14)

(/Applications/CopyClip.app/Contents/Library/LoginItems/CopyClipHelper.app)

Internet Plug-ins:

AdobeAAMDetect: AdobeAAMDetect 1.0.0.0 (installed 2016-08-10)

FlashPlayer-10.6: 28.0.0.161 (installed 2018-02-06)

QuickTime Plugin: 7.7.3 (installed 2018-01-30)

AdobePDFViewerNPAPI: 17.012.20098 (installed 2018-02-25)

AdobePDFViewer: 18.011.20038 (installed 2018-02-25)

Flash Player: 28.0.0.161 (installed 2018-02-06)

Default Browser: 601 (installed 2016-07-09)

Flip4Mac WMV Plugin: 3.2.0.16 (installed 2013-10-01)

SharePointBrowserPlugin: 14.7.3 (installed 2017-06-16)

Audio Plug-ins:

DVCPROHDAudio: 1.3.2 (installed 2012-08-09)

Safari Extensions:

AdBlock.safariextz - BetaFish, Inc. - https://getadblock.com (installed 2018-02-05)

Save to Pocket.safariextz - Read It Later, Inc. - http://getpocket.com/ (installed 2016-09-12)

Secrets - Mac App Store - (installed )

wrc.safariextz - AVAST Software - http://www.avast.com (installed 2015-03-04)

1Password Safari Extension Companion - Mac App Store - (installed )

3rd Party Preference Panes:

Flash Player (installed 2018-02-02)

Flip4Mac WMV (installed 2013-03-29)

FUSE for OS X (OSXFUSE) (installed 2016-01-18)

GPGPreferences (installed 2016-07-11)

ArcanaStartupSound (installed 2009-09-12)

Tuxera NTFS (installed 2013-11-06)

Time Machine:

Skip System Files: No

Mobile backups: Yes

Auto backup: Yes

Volumes being backed up:

S***************B: Disk size: 498.91 GB - Disk used: 391.55 GB

Destinations:

6****************e [Local] (Last used)

Total size: 6.00 TB

Total number of backups: 15

Oldest backup: 2017-08-25 13:02:19

Last backup: 2018-03-02 06:10:27

Top Processes by CPU:

Process (count) Source % of CPU

WindowServer Apple 8

plugin-container (4) Mozilla Corporation 3

devolonetsvc 2

firefox Mozilla Corporation 2

kernel_task Apple 2

Top Processes by Memory:

Process (count) Source RAM usage

plugin-container (4) Mozilla Corporation 961 MB

kernel_task Apple 688 MB

firefox Mozilla Corporation 646 MB

IM+ Helper (7) Mac App Store 529 MB

mds_stores Apple 175 MB

Top Processes by Energy Use:

Process (count) Source Energy usage (0-100)

WindowServer Apple 4

plugin-container (4) Mozilla Corporation 2

Activity Monitor Apple 1

firefox Mozilla Corporation 1

IM+ Helper (7) Mac App Store 0

Virtual Memory Information:

Available RAM 2.36 GB

Free RAM 41 MB

Used RAM 5.64 GB

Cached files 2.32 GB

Swap Used 10 MB

Software Installs (past 30 days):

Name Version Install Date

Doo 2.2.5 2018-02-09

Todoist 7.0.11 2018-02-13

Memory Cleaner 2.4.4 2018-03-04

Evernote 7.0.2 2018-03-05

Novabench 4.0.1 2018-03-05

IM+ 1.9.0 2018-03-05

Clean up:

/Library/LaunchAgents/com.brother.LOGINserver.plist

/Library/Printers/Brother/Utilities/Server/LOGINserver.app/Contents/MacOS/LOGIN server

Executable not found

Diagnostics Information (past 7 days):

2018-03-06 13:23:18 rpcsvchost CPU

2018-03-06 13:18:02 Last Shutdown Cause: 0 - Power loss

2018-03-03 17:00:06 Adobe Lightroom.app CPU

2018-03-02 10:40:18 Gramblr.app Crash

2018-03-02 00:05:48 backupd CPU

End of report

Please note:

Even though the EtreCheck reports says that it detected Adware on my system I don't see anything on my Activity Monitor using a lot of CPU or Memory. So I don't think this could cause my mac slowing down. Still trying to get that Adware off my system with anti virus software. Working on that.

Also I find it strange that EtreCheck gives a different size of free space (114 GB) on my HDD (disk2s2). According to Finder on my HDD should be 302 GB of free space and Disk Inventory X says there should be 281 GB free. Is that normal?