http://bugs.winehq.org/show_bug.cgi?id=11553
--- Comment #8 from Dmitry Timoshkov dmitry@codeweavers.com 2008-02-21 04:11:46 --- Created an attachment (id=10879) --> (http://bugs.winehq.org/attachment.cgi?id=10879) Ad an optimized path for BitBlt(SRCINVERT) to winex11.drv
Although Alexandre said that the code already does as much as it can, I decided to try anyway. Attached patch makes mouse movements with very large brush sizes as smooth as with small ones for me.