Okay - it's encouraging to learn that!
The first procedure seems to have slightly sped up the modulation of the Adjust Image sliders. But perhaps there is a bit of 'placebo effect'!
Etrecheck results:
(Note. Apologies for any newbie-ness I may exhibit, I recently converted from Windows. This is the only instance of slow Mac performance encountered.)
EtreCheck version: 2.9.11 (264)
Report generated 2016-04-25 09:48:35
Download EtreCheck from https://etrecheck.com
Runtime 1:34
Performance: Excellent
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:ⓘ
MacBook Pro (Retina, 13-inch, Mid 2014)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Pro - model: MacBookPro11,1
1 2.6 GHz Intel Core i5 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery: Health = Normal - Cycle count = 127
Video Information:ⓘ
Intel Iris
Color LCD 2560 x 1600
System Software:ⓘ
OS X El Capitan 10.11.4 (15E65) - Time since boot: less than an hour
Disk Information:ⓘ
APPLE SSD SM0128F disk0 : (121.33 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 120.15 GB (57.75 GB free)
Encrypted AES-XTS Unlocked
Core Storage: disk0s2 120.47 GB Online
USB Information:ⓘ
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Razer Razer DeathAdder 2013
Thunderbolt Information:ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper:ⓘ
Mac App Store and identified developers
Kernel Extensions:ⓘ
/Library/Extensions
[loaded] com.avatron.AVExFramebuffer (3.0.1 - SDK 10.11 - 2016-04-06) [Support]
[loaded] com.avatron.AVExVideo (3.0.1 - SDK 10.11 - 2016-04-06) [Support]
System Launch Agents:ⓘ
[not loaded] 7 Apple tasks
[loaded] 160 Apple tasks
[running] 71 Apple tasks
System Launch Daemons:ⓘ
[not loaded] 46 Apple tasks
[loaded] 159 Apple tasks
[running] 84 Apple tasks
Launch Daemons:ⓘ
[loaded] com.microsoft.office.licensingV2.helper.plist (2015-12-06) [Support]
User Launch Agents:ⓘ
[loaded] com.google.keystone.agent.plist (2016-03-03) [Support]
User Login Items:ⓘ
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Air Display Host Application (/Applications/Air Display Host.app)
Other Apps:ⓘ
[running] com.avatron.AirDisplayHelper.64672
[running] com.avatron.AirDisplayHost2.64352
[running] com.google.Chrome.135712
[loaded] 395 Apple tasks
[running] 180 Apple tasks
Internet Plug-ins:ⓘ
Default Browser: 601 - SDK 10.11 (2016-03-27)
QuickTime Plugin: 7.7.3 (2016-03-27)
Safari Extensions:ⓘ
Adblock Plus - Eyeo GmbH - https://adblockplus.org/ (2016-01-01)
3rd Party Preference Panes:ⓘ
None
Time Machine:ⓘ
Time Machine not configured!
Top Processes by CPU:ⓘ
5% WindowServer
3% AirDisplayHelper
3% Google Chrome Helper(16)
2% fontd
1% kernel_task
Top Processes by Memory:ⓘ
2.19 GB Google Chrome Helper(16)
1.04 GB Keynote
883 MB kernel_task
311 MB mdworker(14)
238 MB Google Chrome
Virtual Memory Information:ⓘ
59 MB Free RAM
7.94 GB Used RAM (1.32 GB Cached)
0 B Swap Used
Diagnostics Information:ⓘ
Apr 25, 2016, 09:35:24 AM Self test - passed
Apr 22, 2016, 06:35:05 PM ~/Library/Logs/DiagnosticReports/Xcode_2016-04-22-183505_[redacted].crash
com.apple.dt.Xcode - /Applications/Xcode.app/Contents/MacOS/Xcode