Choppy playback of all flash/facebook videos on MacBook (Mid 2010) (clean yosemite installation!!)

Hi!
I did an upgrade from Mavericks to Yosemite on my MB Pro 13" (Mid 2010). Now I got a lot of problems with videos (flash) in Safari 8.
I seams that there is an issue while loading the video stream. After the loading most of the videos have a smooth playback.
Firefox works perfect and HTML5 videos on YouTube are no problem!
I did several tests:
- safari reset
- abobe flash reinstall
- deactivation of hardware acceleration in adobe flash
- test with a new user account/profile on OS X
- WiFi off and use a wired connection
- CLEAN install of Yosemite !!!
Any idea?

From your Safari menu bar click Safari > Preferences then select the Privacy tab.
Click: Remove All Website Data
Open System Preferences > Flash Player then select the Advanced tab.
Click Delete All under Browsing Data and Settings
Now delete the Safari cache.
Open a Finder window. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following
~/Library/Caches/com.apple.Safari/Cache.db
Click Go then move the Cache.db file to the Trash.
Quit and relaunch Safari then try a video.

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