Confirmed with 12.04. The problem seems to be the active blur.
Using the compiz benchmark plugin, I found:
1. Scrolling the dash is fast (60 FPS) if there is no window updating behind it.
2. Scrolling the dash is terribly slow (15 FPS) if there is a busy app
redrawing behind it (like glxgears).
15 FPS on a quad-core i7 with HD 3000 graphics should be considered a
bug, I think.
** Changed in: unity
Status: Incomplete => Confirmed
** Changed in: unity (Ubuntu)
Status: Incomplete => Confirmed
** Summary changed:
- Dash in Unity 3d lags when an open window is not minimized
+ Refreshing active blur makes the dash painfully slow
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https://bugs.launchpad.net/bugs/874230
Title:
Refreshing active blur makes the dash painfully slow
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