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I bore this problem for a long time. I even formatted my disk and have a clean installation. However, this problem does exist.

After I boot my RMBP, everything is fine. I can drag every thing, every window smoothly. When I use this computer for hours, however, every thing becomes slow. Sometimes, there is a long response after I hitting a key.

I always use RMBP with an external monitor -- a dell display. And it seems that after awaking from a long time sleep, situation gets worse.

Is there anyone has the familiar problem? How can I fix it?

I now waiting for 10.10.2, I hope this patch could solve my problem.

By the way: I tried reinstall Mavericks and the problem gone away. However, I prefer the Yosemite theme very much, so, I don't want to roll back. $_$

  • Exact same issue, it is driving me nuts. The apple store even replaced my logic board, but it didnt do anything. I have a 13 inch late 2013 rMBP. – user110562 Jan 21 '15 at 18:27
  • When things get slow - can someone provide a picture of what Activity Monitor shows for Memory and CPU? @Dejan - please start a new thread if you can provide these details. – bmike Jan 21 '15 at 18:34

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