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.
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?