I can confirm the problem with Kwin (KDE4) on Intel graphics (945GM).
When I disable compositing (Alt+Shift+F12) the drag and drop is fast
again. It also works fine with Compiz.

I notice it is dependant on the size of the thing being dragged around.
If you drag a small 5 letter word it works fine but when you try it with
>10 letters it gets noticeably slower. My threshold is 9 characters
using the monospace font featured in these comments. CPU jumps from 35%
with 8 char to 100% with 9 char.

Is this fixed in KDE 4.2b?

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Text drag and drop causes system freeze
https://bugs.launchpad.net/bugs/293930
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