Safari 7.1.2 very slow with web pages containing flash animations

Hello,
Since I haved installed the last flash plugin update, safari 7.1.2 (mac os 10.9.5) is very slow on pages containing flash stuff.
Already try to clean "cache.db", "reinitialize safari" from "safari menu", does not work ...
While surfing the console display following messages :
29/12/2014 15:42:19,720 xpcd[281]: Info.plist does not contain an XPCService dictionary: /System/Library/Frameworks/Security.framework/XPCServices/SecurityAgent.xpc
29/12/2014 15:42:20,392 com.apple.launchd[1]: (com.apple.qtkitserver[500]) Could not terminate job: 3: No such process
29/12/2014 15:42:20,392 com.apple.launchd[1]: (com.apple.qtkitserver[500]) Using fallback option to terminate job...
Thank you for your help.

From the Safari menu bar, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data...
and confirm. Close the window. Then select
           ▹ System Preferences… ▹ Flash Player ▹ Advanced ▹ Delete All...
In the sheet that opens, check the box marked
          Delete All Site Data and Settings
then click Delete Data. Close the preference pane. Test.
If you use a FireWire audio interface, disconnect it and test again. If you don't know what a FireWire audio interface is, you don't have one.

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