My 2011 desktop Mac is running slow after High Sierra upgrade

Hi everything in my computer is running super slow and my microphone wont work anymore either. Please help. I ran an EtreCheck below are the results but I think it is telling me I need more RAM but not too sure.

EtreCheck version: 3.4.6 (460)

Report generated 2017-12-11 23:01:26

Download EtreCheck from https://etrecheck.com

Runtime: 6:15

Performance: Below Average

Click 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 slow

Description:

Computer takes forever to do simple commands and my microphone wone work after downloading High Sierra.

Hardware Information:ⓘ

iMac (21.5-inch, Mid 2011)

[Technical Specifications] - [User Guide] - [Warranty & 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/n

iCloud Quota: 143.45 GB available

Video Information:ⓘ

AMD Radeon HD 6750M - VRAM: 512 MB

iMac 1600 x 900

Disk Information:ⓘ

WDC WD5000AAKS-402AA0 disk0: (500.11 GB) (Rotational)

[Show SMART report]

EFI (disk0s1 - MS-DOS FAT32) <not mounted> [EFI]: 210 MB

Macintosh HD (disk0s2 - Journaled HFS+) / [Startup]: 499.25 GB (319.29 GB free)

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

OPTIARC DVD RW AD-5680H ()

USB Information:ⓘ

USB20Bus

hub_device

Apple Computer, Inc. IR Receiver

Apple Internal Memory Card Reader

USB20Bus

Apple Inc. FaceTime HD Camera (Built-in)

hub_device

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller

Thunderbolt Information:ⓘ

Apple Inc. thunderbolt_bus

System Software:ⓘ

macOS High Sierra 10.13.1 (17B1003) - Time since boot: about one day

Gatekeeper:ⓘ

Mac App Store and identified developers

Clean up:ⓘ

~/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!

2 orphan files found. [Clean up]

Kernel Extensions:ⓘ

/Library/Extensions

[loaded] com.sophos.kext.oas (9.6.53 - SDK 10.11) [Lookup]

[loaded] com.sophos.nke.swi (9.6.52 - SDK 10.11) [Lookup]

System Launch Agents:ⓘ

[failed] com.apple.assistant_service.plist (Apple, Inc. - installed 2017-10-25)

[not loaded] 9 Apple tasks

[loaded] 168 Apple tasks

[running] 85 Apple tasks

[killed] 25 Apple tasks

25 processes killed due to insufficient RAM

System Launch Daemons:ⓘ

[not loaded] 37 Apple tasks

[loaded] 176 Apple tasks

[running] 93 Apple tasks

[killed] 25 Apple tasks

25 processes killed due to insufficient RAM

Launch Agents:ⓘ

[loaded] com.citrix.AuthManager_Mac.plist (? 8bba567b a79d23af - installed 2014-11-08) [Lookup]

[running] com.citrix.ServiceRecords.plist (? 484f5457 78dca0cf - installed 2014-11-08) [Lookup]

[loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2017-09-27) [Lookup]

[loaded] com.oracle.java.Java-Updater.plist (? 8dfb1081 f8817326 - installed 2015-09-22) [Lookup]

[running] com.sophos.agent.plist (Sophos - installed 2017-09-27) [Lookup]

[running] com.sophos.uiserver.plist (Sophos - installed 2017-09-27) [Lookup]

Launch Daemons:ⓘ

[failed] com.adobe.fpsaud.plist (? 2afb3af7 6cf41d3c - installed 2016-04-15) [Lookup]

[not loaded] com.apple.installer.cleanupinstaller.plist (? 1963bf56 0 - installed 2017-11-19)

[loaded] com.google.keystone.daemon.plist (Google, Inc. - installed 2017-10-12) [Lookup]

[loaded] com.microsoft.autoupdate.helper.plist (Microsoft Corporation - installed 2017-04-24) [Lookup]

[loaded] com.microsoft.office.licensing.helper.plist (? 6d8cb30e cf9ce3fb - installed 2014-02-26) [Lookup]

[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2015-09-22) [Lookup]

[running] com.sophos.common.servicemanager.plist (Sophos - installed 2017-09-27) [Lookup]

User Launch Agents:ⓘ

[running] com.amazon.music.plist (? 7c73c27a 7fed7284 - installed 2015-02-10) [Lookup]

[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (Citrix Online LLC - installed 2017-01-27) [Lookup]

[loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-15) [Lookup]

[failed] com.jdibackup.ZipCloud.autostart.plist (? f16e733d 0 - installed 2016-11-30) [Lookup] - /Applications/ZipCloud.app/Contents/Resources/Utility.app: Executable not found!

[failed] com.jdibackup.ZipCloud.notify.plist (? b9dfd8b3 0 - installed 2016-11-30) [Lookup] - /Applications/ZipCloud.app/Contents/Resources/Utility.app: Executable not found!

User Login Items:ⓘ

Dropbox Application

(/Applications/Dropbox.app)

iTunesHelper Application (Apple, Inc. - installed 2017-12-07)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Internet Plug-ins:ⓘ

o1dbrowserplugin: 5.41.3.0 (installed 2015-12-16) [Lookup]

Google Earth Web Plug-in: 7.1 (installed 2013-09-05) [Lookup]

AdobePDFViewerNPAPI: 10.1.9 (installed 2014-01-23) [Lookup]

FlashPlayer-10.6: 21.0.0.226 (installed 2016-04-25) [Lookup]

Silverlight: 5.1.41212.0 (installed 2016-03-03) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-10-25)

Flash Player: 21.0.0.226 (installed 2016-04-25) Outdated! Update

CitrixICAClientPlugIn: 11.5.0 (installed 2012-04-03) [Lookup]

googletalkbrowserplugin: 5.41.3.0 (installed 2015-12-11) [Lookup]

AdobePDFViewer: 10.1.9 (installed 2014-01-23) [Lookup]

SharePointBrowserPlugin: 14.6.9 (installed 2016-10-12) [Lookup]

iPhotoPhotocast: 7.0 (installed 2012-04-04)

JavaAppletPlugin: Java 8 Update 60 build 27 (installed 2015-09-22) Check version

User internet Plug-ins:ⓘ

CitrixOnlineWebDeploymentPlugin: 1.0.105 (installed 2013-04-25) [Lookup]

Safari Extensions:ⓘ

[enabled] Amazon Assistant for Safari - Amazon - https://www.amazon.com/gp/BIT/AmazonAssistant/TOU (installed 2017-11-18)

[enabled] Zotero Connector - Center for History and New Media - http://www.zotero.org/ (installed 2015-12-12)

3rd Party Preference Panes:ⓘ

Flash Player (installed 2016-04-15) [Lookup]

Java (installed 2015-08-04) [Lookup]

Time Machine:ⓘ

Time Machine not configured!

Top Processes by CPU:ⓘ

16% com.apple.WebKit.Networking

14% WindowServer

11% nsurlstoraged

10% com.apple.WebKit.WebContent

5% Safari

Top Processes by Memory:ⓘ

551 MB kernel_task

312 MB com.apple.WebKit.WebContent

156 MB Safari

132 MB System Information

80 MB SophosScanD

Top Processes by Network Use:ⓘ

Input Output Process name

342 KB 42 KB mDNSResponder

78 KB 133 KB Dropbox

35 KB 102 KB SophosSXLD

31 KB 28 KB apsd

13 KB 7 KB SophosWebIntelligence

Top Processes by Energy Use:ⓘ

14.70 WindowServer

9.46 com.apple.WebKit.WebContent

7.28 Safari

6.86 com.apple.WebKit.Networking

Virtual Memory Information:ⓘ

810 MB Available RAM

15 MB Free RAM

3.21 GB Used RAM

796 MB Cached files

19 MB Swap Used

Diagnostics Events (last 3 days for minor events):ⓘ

2017-12-11 22:34:34 Opera.app Crash [Open]

Cause: *** multi-threaded process forked ***

crashed on child side of fork pre-exec

2017-12-10 17:05:39 webfilterproxyd Crash [Open]

Cause: objc_msgSend() selector name: release