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Video lag in youtube etc

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Hi all,basically iv got a new gfx card,moniter and sdd drive so fresh install of windows etc.when i play a video on youtube its all jumping,if i wave my cursor over the video the frames must drop to like 1 frame every 5 seconds.it also lags all tabs if i go onto the video and watch it etc,the video will freeze but the sound continues fine.reinstalled firefox and flash player,disabled all add ons etc.updated all my drivers etc,even trying to scroll down the page can freeze it for 5+ seconds,everything fine in chrome but im a firefox guy! :P

Hi all,basically iv got a new gfx card,moniter and sdd drive so fresh install of windows etc.when i play a video on youtube its all jumping,if i wave my cursor over the video the frames must drop to like 1 frame every 5 seconds.it also lags all tabs if i go onto the video and watch it etc,the video will freeze but the sound continues fine.reinstalled firefox and flash player,disabled all add ons etc.updated all my drivers etc,even trying to scroll down the page can freeze it for 5+ seconds,everything fine in chrome but im a firefox guy! :P

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ok fixed it lol,straight after i posted this .... basicly i followed the firefox guide and downgraded the adobe flash player to 10.3. il post link below for anyone else having this problem,not sure why flash player 11 isnt working for me though :(

https://support.mozilla.org/en-US/kb/flash-113-doesnt-load-video-firefox#w_solution-2-downgrade-flash