laggy animation on youtube fullscreen

when I am watching video on youtube when I go fullscreen on safari the animation appears and going full screen goes very slow and laggy. when i exit fullscreen the animation kicks in again which makes the whole experience very slow and laggy. I am using macbook pro 2015 model on mac os sierra , this is the first time I am experiencing lag on safari also theres a lag on Facebook when scrolling down the page. thanks

MacBook Pro with Retina display, macOS Sierra (10.12)

Posted on Oct 20, 2016 11:12 AM

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5 replies

Oct 21, 2016 9:16 AM in response to ims99

Safari/Preferences/Advanced - enable the Develop menu, then go there and Empty Caches. Quit/reopen Safari and test. Then try Safari/History/Show History and delete all history items. Quit/reopen Safari and test. You can also try try Safari/Clear History…. The down side is it clears all cookies. Doing this may cause some sites to no longer recognize your computer as one that has visited the web site. Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library/Caches/com.apple.Safari/Cache.db and move it to the trash.


Go to Safari Preferences/Extensions and turn all extensions off. Test. If okay, turn the extensions on one by one until you figure out what extension is causing the problem.


Safari Corruption See post by Linc Davis

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laggy animation on youtube fullscreen

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