mac book pro very slow el capitan

Hello,

my MacBook Pro is running very slow. It freezes sometimes and i get SBBOD a lot. I have not installed mac keeper or such, and I have read and followed these instructions: How to eliminate slow Mac problems

Here is my EtreCheck-report:

EtreCheck version: 2.6.6 (226)

Report generated 02.01.16, 14:48

Runtime 37:04

Download EtreCheck from http://etrecheck.com

Hardware Information: (What does this mean?)

MacBook Pro (13-inch, Mid 2012)

[Click for Technical Specifications]

[Click for User Guide]

MacBook Pro - model: MacBookPro9,2

1 2,5 GHz Intel Core i5 CPU: 2-core

8 GB RAM Upgradeable

[Click for upgrade instructions]

BANK 0/DIMM0

4 GB DDR3 1600 MHz ok

BANK 1/DIMM0

4 GB DDR3 1600 MHz ok

Bluetooth: Good - Handoff/Airdrop2 supported

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

Battery: Health = Normal - Cycle count = 390 - SN = W043115GLD3LC

Video Information: (What does this mean?)

Intel HD Graphics 4000

Color LCD 1280 x 800

System Software: (What does this mean?)

OS X El Capitan 10.11.2 (15C50) - Time since boot: about one hour

Disk Information: (What does this mean?)

APPLE HDD TOSHIBA MK5065GSXF disk0 : (500,11 GB) (Rotational)

EFI (disk0s1) <not mounted> : 210 MB

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

+# (disk1) / : 498.88 GB (416.04 GB free)

Core Storage: disk0s2 499.25 GB Online

HL-DT-ST DVDRW GS31N ()

USB Information: (What does this mean?)

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Inc. FaceTime HD Camera (Built-in)

Thunderbolt Information: (What does this mean?)

Apple Inc. thunderbolt_bus

Gatekeeper: (What does this mean?)

Mac App Store and identified developers

Launch Agents: (What does this mean?)

[loaded] com.divx.dms.agent.plist [Click for support]

[loaded] com.divx.update.agent.plist [Click for support]

[loaded] com.oracle.java.Java-Updater.plist [Click for support]

Launch Daemons: (What does this mean?)

[loaded] com.adobe.fpsaud.plist [Click for support]

[loaded] com.microsoft.office.licensing.helper.plist [Click for support]

[loaded] com.oracle.java.Helper-Tool.plist [Click for support]

[loaded] com.sonos.smbbump.plist [Click for support]

User Launch Agents: (What does this mean?)

[loaded] com.google.keystone.agent.plist [Click for support]

User Login Items: (What does this mean?)

Plex Media Server Programm (/Applications/Plex Media Server.app)

Other Apps: (What does this mean?)

[running] com.etresoft.EtreCheck.121632

[running] org.mozilla.firefox.48352

Internet Plug-ins: (What does this mean?)

OVSHelper: Version: 1.1 [Click for support]

Default Browser: Version: 601 - SDK 10.11

Flip4Mac WMV Plugin: Version: 3.0.0.126 - SDK 10.8 [Click for support]

DivX Plus Web Player: Version: 2.3 - SDK 10.5 [Click for support]

AdobePDFViewerNPAPI: Version: 11.0.13 - SDK 10.6 [Click for support]

FlashPlayer-10.6: Version: 20.0.0.267 - SDK 10.6 [Click for support]

Silverlight: Version: 5.1.20913.0 - SDK 10.6 [Click for support]

QuickTime Plugin: Version: 7.7.3

Flash Player: Version: 20.0.0.267 - SDK 10.6 [Click for support]

SharePointBrowserPlugin: Version: 14.5.9 - SDK 10.6 [Click for support]

AdobePDFViewer: Version: 11.0.13 - SDK 10.6 [Click for support]

JavaAppletPlugin: Version: Java 8 Update 66 build 17 Check version

Safari Extensions: (What does this mean?)

Adblock Plus

3rd Party Preference Panes: (What does this mean?)

Flash Player [Click for support]

Flip4Mac WMV [Click for support]

Java [Click for support]

Time Machine: (What does this mean?)

Mobile backups: OFF

Auto backup: NO - Auto backup turned off

Volumes being backed up:

+#: Disk size: 498.88 GB Disk used: 82.84 GB

Destinations:

TimeMachine [Network]

Total size: 3.97 TB

Total number of backups: 16

Oldest backup: 26.12.15, 15:33

Last backup: 01.01.16, 19:38

Size of backup disk: Excellent

Backup size 3.97 TB > (Disk size 498.88 GB X 3)

Top Processes by CPU: (What does this mean?)

5% WindowServer

2% kernel_task

0% cloudpaird

Top Processes by Memory: (What does this mean?)

786 MB com.apple.WebKit.WebContent

724 MB kernel_task

598 MB firefox

246 MB Safari

238 MB iTunes

Virtual Memory Information: (What does this mean?)

2.12 GB Free RAM

5.88 GB Used RAM (2.59 GB Cached)

0 B Swap Used

Diagnostics Information: (What does this mean?)

Jan 2, 2016, 01:02:17 PM Self test - passed

Thanks for your help

Benni