Thanks for your offer to help,
Below is the etreCheck report, along with my note that when I look at it and see many processed killed due to insufficient RAM, it does not make sense because when I look at Activity Monitor undrer RAM, memory pressure is in green.
EtreCheck version: 2.9.12 (265)
Report generated 2016-06-03 12:13:31
Download EtreCheck from https://etrecheck.com
Runtime 11:40
Performance: Poor
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Beachballing
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
8 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 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 El Capitan 10.11.4 (15E65) - 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 (618.49 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
OPTIARC DVD RW AD-5690H ()
USB Information: ⓘ
Primax Electronics Apple Optical USB Mouse
Apple Computer, Inc. IR Receiver
Apple Card Reader
Apple Inc. FaceTime HD Camera (Built-in)
hp deskjet 5550
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Firewire Information: ⓘ
Iomega HDD unknown_device 800mbit - 800mbit max
EFI (disk1s1) <not mounted> : 210 MB
Iomega HDD (disk1s2) /Volumes/Iomega HDD : 999.86 GB (460.28 GB free)
Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper: ⓘ
Mac App Store and identified developers
Kernel Extensions: ⓘ
/System/Library/Extensions
[loaded] zoom.us.ZoomAudioDevice (1.2 - SDK 10.9 - 2016-05-16) [Support]
System Launch Agents: ⓘ
[not loaded] 9 Apple tasks
[loaded] 153 Apple tasks
[running] 53 Apple tasks
[killed] 23 Apple tasks
23 processes killed due to insufficient RAM
System Launch Daemons: ⓘ
[not loaded] 45 Apple tasks
[loaded] 155 Apple tasks
[running] 70 Apple tasks
[killed] 18 Apple tasks
18 processes killed due to insufficient RAM
Launch Agents: ⓘ
[not loaded] com.adobe.AAM.Updater-1.0.plist (2016-04-14) [Support]
[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a...plist (2016-05-11) [Support]
[running] com.adobe.AdobeCreativeCloud.plist (2016-03-17) [Support]
Launch Daemons: ⓘ
[loaded] com.adobe.ARMDC.Communicator.plist (2016-05-11) [Support]
[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (2016-05-11) [Support]
[not loaded] com.adobe.SwitchBoard.plist (2015-04-06) [Support]
[running] com.adobe.adobeupdatedaemon.plist (2016-04-14) [Support]
[loaded] com.adobe.agsservice.plist (2016-03-02) [Support]
[loaded] com.adobe.fpsaud.plist (2016-04-04) [Support]
[running] com.backblaze.bzserv.plist (2015-05-15) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2014-02-26) [Support]
User Launch Agents: ⓘ
[loaded] com.adobe.AAM.Updater-1.0.plist (2015-04-08) [Support]
[loaded] com.adobe.ARM.[...].plist (2016-02-05) [Support]
[loaded] com.aviator.agent.plist (2015-05-18) [Support]
[running] com.backblaze.bzbmenu.plist (2016-06-03) [Support]
[running] com.c-command.SpamSieve.LaunchAgent.plist (2016-06-03) [Support]
[loaded] com.google.keystone.agent.plist (2016-03-01) [Support]
User Login Items: ⓘ
SkyFonts Application (/Applications/SkyFonts/SkyFonts.app)
iTunesHelper Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application Hidden (/Applications/Dropbox.app)
TextExpander Application Hidden (/Applications/TextExpander.app)
Mail Application (/Applications/Mail.app)
Things Application (/Applications/Things.app)
ChronoMate Application Hidden (/Applications/ChronoMate.app)
Growl Application Hidden (/Applications/Growl.app)
Guidance Application Hidden (/Applications/Guidance.app)
Captur Application Hidden (/Applications/Captur.app)
TransmitMenu Application (/Applications/Transmit.app/Contents/MacOS/TransmitMenu.app)
Alfred 2 Application (/Applications/Alfred 2.app)
Printer Pro Desktop Application (/Applications/Printer Pro Desktop.app)
Other Apps: ⓘ
[running] 2BUA8C4S2C.com.agilebits.onepassword4-helper
[running] P97H7FTHWN.com.realmacsoftware.ember.librarymediator
[running] com.Growl.GrowlHelperApp.63072
[running] com.adobe.CCLibrary.149472
[running] com.adobe.CCXProcess.148832
[running] com.adobe.acc.AdobeDesktopService.135072.99C84F14-2E5C-494B-829D-013CC8DE071D
[running] com.adobe.accmac.147552
[running] com.agilebits.onepassword4.94112
[loaded] com.batoulapps.GuidanceLauncher
[running] com.batoulapps.GuidanceMac.63392
[running] com.c-command.SpamSieve.78752
[running] com.cescobaz.ColorMakerHelper
[running] com.cescobaz.iColor.55712
[loaded] com.culturedcode.things.80032
[running] com.getdropbox.dropbox.58912
[loaded] com.google.Chrome.103072
[loaded] com.growl.GrowlLauncher
[running] com.koolesache.ColorSnapper.56672
[loaded] com.koolesache.ColorSnapperHelper
[running] com.mti.Monotype-SkyFonts.154272
[running] com.mti.Monotype-SkyFontsHelper
[running] com.mti.Monotype-SkyFontsHelper.162592
[running] com.panic.Transmit.TransmitMenu.106272
[loaded] com.quadbyte.ChronoMateLoginHelperApp
[running] com.quadbyte.chronomate.55072
[loaded] com.realmacsoftware.ember.storeadapterservice
[running] com.runningwithcrayons.Alfred-2.50912
[running] com.smileonmymac.textexpander.79712
[running] haerul.Captur.54112
[loaded] 402 Apple tasks
[running] 198 Apple tasks
[killed] 45 Apple tasks
Internet Plug-ins: ⓘ
AdobeAAMDetect: 3.0.0.0 - SDK 10.9 (2016-04-14) [Support]
FlashPlayer-10.6: 21.0.0.213 - SDK 10.6 (2016-04-08) [Support]
QuickTime Plugin: 7.7.3 (2016-04-14)
AdobePDFViewerNPAPI: 15.016.20045 - SDK 10.11 (2016-06-02) [Support]
AdobePDFViewer: 15.016.20045 - SDK 10.11 (2016-06-02) [Support]
Flash Player: 21.0.0.213 - SDK 10.6 (2016-04-08) Outdated! Update
Default Browser: 601 - SDK 10.11 (2016-04-14)
SharePointBrowserPlugin: 14.6.4 - SDK 10.6 (2016-05-22) [Support]
Silverlight: 5.1.30514.0 - SDK 10.6 (2015-04-21) [Support]
JavaAppletPlugin: 15.0.1 - SDK 10.11 (2015-04-06) Check version
User internet Plug-ins: ⓘ
ZoomUsPlugIn: 3.5.49863.0509 - SDK 10.11 (2016-05-26) [Support]
Safari Extensions: ⓘ
1Password - AgileBits - https://agilebits.com/onepassword (2016-05-21)
Ember - Realmac Software - http://realmacsoftware.com/ember (2014-01-30)
Buffer - Buffer - http://buffer.com (2015-04-06)
Save to Pocket - Read It Later, Inc. - http://getpocket.com/ (2015-11-06)
Subtle Patterns - Matt Rajca - https://github.com/mattrajca/Safari-Extensions/tree/master/SubtlePatterns (2012-04-05)
un-utm - Joseph Schmitt - http://joe.sh/un-utm (2014-04-16)
3rd Party Preference Panes: ⓘ
Backblaze Backup (2015-05-15) [Support]
Flash Player (2016-04-04) [Support]
Time Machine: ⓘ
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 999.35 GB Disk used: 380.86 GB
Destinations:
Iomega HDD [Local]
Total size: 999.86 GB
Total number of backups: 75
Oldest backup: 11/18/15, 6:25 PM
Last backup: 6/3/16, 11:15 AM
Size of backup disk: Too small
Backup size 999.86 GB < (Disk used 380.86 GB X 3)
Top Processes by CPU: ⓘ
19% Google Chrome Helper(54)
9% Mail
8% Google Chrome
3% CoreServicesUIAgent
3% WindowServer
Top Processes by Memory: ⓘ
4.57 GB Google Chrome Helper(54)
797 MB kernel_task
319 MB mdworker(19)
246 MB Google Chrome
205 MB mds_stores
Virtual Memory Information: ⓘ
62 MB Free RAM
7.94 GB Used RAM (1.28 GB Cached)
10 MB Swap Used
Diagnostics Information: ⓘ
Jun 3, 2016, 11:50:36 AM ~/Library/Logs/DiagnosticReports/Printer Pro Desktop_2016-06-03-115036_[redacted].crash
/Applications/Printer Pro Desktop.app/Contents/MacOS/Printer Pro Desktop
Jun 3, 2016, 11:26:58 AM /Library/Logs/DiagnosticReports/Kernel_2016-06-03-112658_[redacted].panic [Details]
Jun 3, 2016, 11:25:43 AM Self test - passed