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I recently upgraded to Yosemite, and now my laptop has the following issue:

Each and every window (the AppStore, Chrome, etc) seems to be continuously and very slowly redrawn, to the point where I can see the screen go white, and then slowly be drawn back in from the bottom to the top.

The only time when I every encountered a similar issue was when, on Ubuntu, I upgraded and lost support for my graphics card. However, I have no idea how to navigate this issue on OS X.

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    Mac spec would be useful, together with at least an Activity Monitor Memory usage picture.
    – Tetsujin
    Mar 6, 2015 at 20:50
  • Also, a system diagnosis next time it happens. Press shift+control+option+command+period and then wait at least 10 minutes (possibly three times as long if the system is wedged/swapping/slow to run code) before powering it off forcefully if need be. Lastly, can you make this happen or is it a one time / once a month thing?
    – bmike
    Mar 6, 2015 at 20:52
  • Is it just Internet apps ?
    – Ruskes
    Mar 6, 2015 at 20:59
  • @Buscar웃 I had the same problem and it was on every single app. From settings to chrome.
    – Shoe
    Jun 1, 2016 at 20:10

1 Answer 1

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I had this problem and I solved it by resetting the PRAM/NVRAM, which is done via:

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
  3. Turn on your Mac.
  4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
  6. Release the keys.
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  • It's been a while, so I can no longer confirm that this would've solved my problem. I'll accept your answer nonetheless, though.
    – wen
    Jun 11, 2016 at 18:59

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