I have a g500. I can modify frequency of usb port in mouse driver.

My option are 125,200,250,333,500 and 1000 Hz.
By default mouse is at 500 Hz.

The problem is that above 125hz, mouse lag and the movement is jerky.
At 125hz, no problem.

Does it exist a solution to have 500hz and no problem in dosbox?

I try official dosbox 0.74, unofficial daum dosbox last version (december 2012) http://ykhwong.x-y.net/ and same problem.

edit: I find the problem: it''s mouse acceleration that cause the problem with dosbox

Could you make a dosbox compatible with mouse acceleration?