Hi, thanks for your help, these are the results I got:
EtreCheck version: 2.9.12 (265)
Report generated 2016-06-20 17:01:04
Download EtreCheck from https://etrecheck.com
Runtime 5:31
Performance: Below Average
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Computer is too slow
Hardware Information: ⓘ
iMac (27-inch, Mid 2011)
[Technical Specifications] - [User Guide] - [Warranty & Service]
iMac - model: iMac12,2
1 2.7 GHz Intel Core i5 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
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ⓘ
AMD Radeon HD 6770M - VRAM: 512 MB
iMac 2560 x 1440
System Software: ⓘ
OS X Yosemite 10.10.3 (14D136) - Time since boot: less than an hour
Disk Information: ⓘ
ST31000528AS disk0 : (1 TB) (Rotational)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (846.49 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
OPTIARC DVD RW AD-5690H ()
USB Information: ⓘ
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Internal Memory Card Reader
Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper: ⓘ
Mac App Store and identified developers
Kernel Extensions: ⓘ
/System/Library/Extensions
[not loaded] com.wacom.kext.wacomtablet (Wacom Tablet 6.3.9-3 - SDK 10.9 - 2015-12-13) [Support]
System Launch Agents: ⓘ
[not loaded] 5 Apple tasks
[loaded] 147 Apple tasks
[running] 59 Apple tasks
System Launch Daemons: ⓘ
[not loaded] 48 Apple tasks
[loaded] 138 Apple tasks
[running] 77 Apple tasks
Launch Agents: ⓘ
[not loaded] com.adobe.AAM.Updater-1.0.plist (2016-04-20) [Support]
[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a...plist (2016-06-08) [Support]
[running] com.adobe.AdobeCreativeCloud.plist (2016-02-15) [Support]
[running] com.wacom.wacomtablet.plist (2014-09-09) [Support]
Launch Daemons: ⓘ
[loaded] com.adobe.ARMDC.Communicator.plist (2016-06-08) [Support]
[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (2016-06-08) [Support]
[loaded] com.adobe.SwitchBoard.plist (2012-06-14) [Support]
[running] com.adobe.adobeupdatedaemon.plist (2016-04-20) [Support]
[loaded] com.adobe.agsservice.plist (2015-09-28) [Support]
[loaded] com.adobe.fpsaud.plist (2016-05-09) [Support]
[running] com.freemacsoft.appcleanerdaemon.plist (2008-08-19) [Support]
[loaded] jp.co.canon.MasterInstaller.plist (2015-04-18) [Support]
User Launch Agents: ⓘ
[loaded] com.adobe.AAM.Updater-1.0.plist (2012-06-15) [Support]
[loaded] com.adobe.ARM.[...].plist (2013-09-10) [Support]
[loaded] com.apple.FolderActions.folders.plist
[loaded] com.google.keystone.agent.plist (2016-03-30) [Support]
[not loaded] jp.co.canon.Inkjet_Extended_Survey_Agent.plist (2012-12-04) [Support]
User Login Items: ⓘ
Creative Cloud Application (/Applications/Utilities/Adobe Creative Cloud/ACC/Creative Cloud.app)
Other Apps: ⓘ
[running] com.adobe.CCXProcess.127832
[running] com.adobe.acc.AdobeDesktopService.62796.9B3CC3F6-37C5-4C97-B202-302DD5432A00
[running] com.adobe.accmac.125560
[running] com.wacom.TabletDriver.73588
[running] com.wacom.WacomTouchDriver.73304
[loaded] 373 Apple tasks
[running] 162 Apple tasks
Internet Plug-ins: ⓘ
AdobeAAMDetect: 3.0.0.0 - SDK 10.9 (2016-04-20) [Support]
FlashPlayer-10.6: 21.0.0.242 - SDK 10.6 (2016-06-09) [Support]
EPPEX Plugin: 10.0 (2013-10-18) [Support]
AdobePDFViewerNPAPI: 15.010.20056 - SDK 10.8 (2015-12-18) [Support]
AdobePDFViewer: 15.010.20056 - SDK 10.8 (2015-12-18) [Support]
Flash Player: 21.0.0.242 - SDK 10.6 (2016-06-09) Outdated! Update
Default Browser: 600 - SDK 10.10 (2015-06-11)
QuickTime Plugin: 7.7.3 (2015-06-11)
WacomTabletPlugin: WacomTabletPlugin 2.1.0.6 - SDK 10.9 (2014-09-09) [Support]
JavaAppletPlugin: 15.0.0 - SDK 10.10 (2012-06-15) Check version
Safari Extensions: ⓘ
AdBlock - Michael Gundlach - http://safariadblock.com (2015-01-25)
GMail Counter - Elia Cereda - http://elix14.altervista.org/ (2012-08-08)
ClickToFlash - Marc Hoyois - http://hoyois.github.com/safariextensions/clicktoplugin/ (2015-01-22)
1-ClickWeather - TWCi - http://www.weather.com/ (2012-08-08)
3rd Party Preference Panes: ⓘ
Flash Player (2016-05-09) [Support]
FUSE for OS X (OSXFUSE) (2012-09-13) [Support]
WacomTablet (2014-10-17) [Support]
Time Machine: ⓘ
Time Machine not configured!
Top Processes by CPU: ⓘ
125% Google Chrome Helper(23)
90% AdobeGCClient
10% WindowServer
8% Google Chrome
7% kernel_task
Top Processes by Memory: ⓘ
1.94 GB Google Chrome Helper(23)
400 MB kernel_task
184 MB spindump
156 MB Google Chrome
115 MB mdworker(9)
Virtual Memory Information: ⓘ
26 MB Free RAM
3.97 GB Used RAM (739 MB Cached)
2 MB Swap Used
Diagnostics Information: ⓘ
Jun 20, 2016, 04:48:24 PM Self test - passed