High kernel_task CPU usage (above 100%)

My MacBook Pro (late 2011, 13") gets really slow after 3/4 hours of use and only gets normal after restarting. In those situations, kernel_task CPU usage is always above 100%.

I tried resetting NVRAM and SMC and using safe mode, but the problem persists.

EtreCheck below:

EtreCheck version: 3.4.2 (436)

Report generated 2017-08-15 18:34:25

Download EtreCheck from https://etrecheck.com

Runtime: 3:18

Performance: Good

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Problem: Computer is too slow

Hardware Information: ⓘ

MacBook Pro (13-inch, Late 2011)

[Technical Specifications] - [User Guide] - [Warranty & Service]

MacBook Pro - model: MacBookPro8,1

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

16 GB RAM Upgradeable - [Instructions]

BANK 0/DIMM0

8 GB DDR3 1333 MHz ok

BANK 1/DIMM0

8 GB DDR3 1333 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Battery: Health = Normal - Cycle count = 694

Video Information: ⓘ

Intel HD Graphics 3000 - VRAM: 512 MB

DELL U2412M 1920 x 1200

Disk Information: ⓘ

ST9500325ASG disk0: (500,11 GB) (Rotational)

[Show SMART report]

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

(disk0s2) <not mounted> [CoreStorage Container]: 499.25 GB

Recovery HD (disk0s3 - Journaled HFS+) <not mounted> [Recovery]: 650 MB

MATSHITADVD-R UJ-8A8 ()

USB Information: ⓘ

USB20Bus

Apple Inc. FaceTime HD Camera (Built-in)

hub_device

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Inc. BRCM2070 Hub

Apple Inc. Bluetooth USB Host Controller

USB20Bus

hub_device

Wacom Co.,Ltd. Intuos PS

Apple Computer, Inc. IR Receiver

Thunderbolt Information: ⓘ

Apple Inc. thunderbolt_bus

Virtual disks: ⓘ

Macintosh HD (disk1 - Journaled HFS+) / [Startup]: 498.89 GB (271.50 GB free)

Physical disk: disk0s2 499.25 GB Online

System Software: ⓘ

macOS Sierra 10.12.6 (16G29) - Time since boot: less than an hour

Configuration files: ⓘ

/etc/hosts - Count: 1

System Integrity Protection status: disabled

Gatekeeper: ⓘ

Mac App Store and identified developers

Kernel Extensions: ⓘ

/Library/Extensions

[not loaded] com.FTDI.driver.D2XXHelper (1.0 - SDK 10.12) [Lookup]

[not loaded] com.wacom.kext.wacomtablet (Wacom Tablet 6.3.23-3 - SDK 10.12) [Lookup]

System Launch Agents: ⓘ

[not loaded] 9 Apple tasks

[loaded] 187 Apple tasks

[running] 86 Apple tasks

System Launch Daemons: ⓘ

[not loaded] 40 Apple tasks

[loaded] 180 Apple tasks

[running] 96 Apple tasks

Launch Agents: ⓘ

[running] com.adobe.AdobeCreativeCloud.plist (Adobe Systems, Inc. - installed 2017-07-25) [Lookup]

[running] com.diebold.warsaw.user.plist (? 951b4e8c 698c64fd - installed 2016-10-19) [Lookup]

[loaded] com.oracle.java.Java-Updater.plist (? b5fe1c1a 72ac4dde - installed 2017-08-08) [Lookup]

[running] com.wacom.wacomtablet.plist (Wacom Technology Corp. - installed 2017-07-12) [Lookup]

Launch Daemons: ⓘ

[running] com.adobe.adobeupdatedaemon.plist (Adobe Systems, Inc. - installed 2017-07-25) [Lookup]

[running] com.adobe.agsservice.plist (Adobe Systems, Inc. - installed 2017-05-25) [Lookup]

[loaded] com.adobe.fpsaud.plist (? 2afb3af7 85012398 - installed 2017-07-25) [Lookup]

[running] com.diebold.warsaw.plist (? be1144d8 698c64fd - installed 2016-10-19) [Lookup]

[loaded] com.microsoft.autoupdate.helpertool.plist (Microsoft Corporation - installed 2016-09-10) [Lookup]

[loaded] com.microsoft.office.licensingV2.helper.plist (Microsoft Corporation - installed 2016-09-10) [Lookup]

[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-07-22) [Lookup]

[running] com.wacom.TabletHelper.plist (Wacom Technology Corp. - installed 2017-07-12) [Lookup]

[loaded] com.wacom.displayhelper.plist (Apple, Inc. - installed 2017-07-15)

User Launch Agents: ⓘ

[loaded] com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2016-11-12) [Lookup]

[loaded] com.bittorrent.uTorrent.plist (BitTorrent, Inc - installed 2016-11-11) [Lookup]

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

[loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2017-07-10) [Lookup]

User Login Items: ⓘ

Quicksilver Aplicativo

(/Applications/Quicksilver.app)

Flux Aplicativo

(/Applications/Flux.app)

Android File Transfer Agent Aplicativo

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

Internet Plug-ins: ⓘ

FlashPlayer-10.6: 26.0.0.151 (installed 2017-08-08) [Lookup]

Flash Player: 26.0.0.151 (installed 2017-08-08) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-07-24)

JavaAppletPlugin: Java 8 Update 144 build 01 (installed 2017-08-08) Check version

AdobeAAMDetect: 3.0.0.0 (installed 2017-07-25) [Lookup]

WacomTabletPlugin: WacomTabletPlugin 2.1.0.6 (installed 2017-06-22) [Lookup]

3rd Party Preference Panes: ⓘ

Flash Player (installed 2017-07-25) [Lookup]

Java (installed 2017-08-08) [Lookup]

WacomTablet (installed 2017-06-22) [Lookup]

Time Machine: ⓘ

Time Machine not configured!

Top Processes by CPU: ⓘ

11% WindowServer

10% Finder

3% kernel_task

2% plugin-container

2% firefox

Top Processes by Memory: ⓘ

767 MB firefox

764 MB kernel_task

477 MB plugin-container

453 MB plugin-container

324 MB plugin-container

Top Processes by Network Use: ⓘ

Input Output Process name

3 MB 943 KB firefox

374 KB 101 KB mDNSResponder

181 KB 6 KB netbiosd

18 KB 0 B launchd

9 KB 8 KB apsd

Top Processes by Energy Use: ⓘ

9.94 WindowServer

7.74 Finder

2.50 plugin-container

2.44 plugin-container

2.40 firefox

Virtual Memory Information: ⓘ

10.66 GB Available RAM

8.17 GB Free RAM

5.34 GB Used RAM

2.49 GB Cached files

0 B Swap Used

Software installs: ⓘ

GIF Brewery 3: 3.5 (installed 2017-07-19)

GIPHY CAPTURE: 3.6 (installed 2017-07-19)

Java 8 Update 144: (installed 2017-08-08)

Adobe Flash Player: (installed 2017-08-08)

GIF Brewery 3: 3.6 (installed 2017-08-11)

Cleaner for Memory: 2.4.2 (installed 2017-08-12)

Install information may not be complete.

Diagnostics Information: ⓘ

2017-08-15 13:58:17 Adobe Photoshop CC 2017.app High CPU use [Open] [Details]

2017-08-15 10:54:59 Adobe Premiere Pro CC 2017.app High CPU use [Open] [Details]

2017-08-15 10:48:36 Adobe After Effects CC 2017.app High CPU use [Open] [Details]

2017-08-15 10:25:56 Firefox.app High CPU use [Open] [Details]

2017-08-13 13:25:40 quicklookd.app Crash [Open]

Cause: quicklookd seems struck trying to quit, crashing

abort() called