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[Eduards Bezverhijs <edzis@xxxxxxxx>]

Hi, recently I tried installing 14.10 on the same machine on different partition and it seems that problem with rotation + slowdown is gone.
So as a next step was upgrading my trusty Trysty to Utopic. Right after upgrade (and before login) I deleted monitors.xml file from my working profile (user) and viola problem is gone.
So gar so good, I would like to say. So the problem was related to monitors.xml or updates between my last try and this one, or both.
Can't say whether slowdown is gone as I'm using the system for just about one day.
Will report back with the results.

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https://bugs.launchpad.net/bugs/1387558

Title:
  Compiz slows down over time (usually one day is enough)

Status in Compiz:
  Incomplete
Status in Unity:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  I have had this problem for quite a long time tbh. And after each release I hope it will be fixed, but it doesn't happen.
  A little intro: I'm using Ubuntu for work, I rarely shutdown the computer I rather put it to sleep mode, in worst case it's hibernate. I have loads of apps opened at the same time. I use external monitor as well. Computer is Dell XPS15 L521X, 16Gb RAM, 120GB SSD + 1TB HDD. As a graphics card I'm using builtin intel HD4000, I have GF GT640 as well but it's disabled using bbswitch.

  Symptoms are that after some time compiz slows down a lot while using
  it. Usually it's no more than 2 days and it's slow again. When I
  restart Unity (setsid unity) it's back to full buttersmooth speed with
  the same apps opened which leads to conclusion that compiz can handle
  the load very well. Maybe it's mesa, maybe it's compiz or unity itself
  that slows it down - but I'm no pro to tell.

  With 14.10 release I observed very interesting behaviour. I have FHD
  builtin monitor and FHD external monitor rotated counterclockwise.
  Let's say I started computer yesterday in the morning, it was working
  smooth with both monitors and single display, I suspended computer got
  home unsuspended and it seemed sluggish (only graphics part of
  course). I ran glxgears (I know I know...) and it showed ~ 50FPS which
  is slow, because running the same before suspend gives near 60FPS
  (refresh rate). Now I come back to work and run it on single builtin
  display - ~ 50 FPS, I connect second FHD dispplay and FPS are back to
  60 and it's running buttersmooth again. So it seems that
  mesa/compiz/unity have some strange refresh rate problem detection
  maybe... 2 FHD displays seems to be twice the job compiz has to do
  over single display which is strangely slower...

  Please advise how can I help solving this, do I need to run compiz
  debug version or what can I exactly help technically (applying a
  patch, compiling compiz myself, you name it...). I know the standard
  procedure of logs etc., I'm afraid that won't help much in this
  situation. I looked at logs and there's nothing suspicious, at least
  to me.

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