I got a Logitech G15 to x-mas, now I have the problem that I get really hard lags when I try to strafe and use the mouse at the same moment. I can look around with my mouse (Razer Diamondback) and strafe without lag, but as soon as I do it the same moment, I get a lag. Before this keyboard I had a 10 year old no-name keyboard wich was connected with PS/2. I tried OpenOffice and RTCW, there the bug didnt occure.

which quakeworld client you using? Did you download the updated software from logitech's site?

I have a G5 mouse and not having issue, but someone else I know downloaded nquake setup and was having lag with one of this scripts.

OK I just downloaded EZQuake 1.9.2 and I still have the same problem. I use the most recent software I could found. Btw I meant OpenArena and not OpenOffice.

Kind of found the error. I deinstalled the software for the keyboard and after rebooting only plugged in the keyboard without installing any software. Tried QW and had no lags. After installing the software which came with the keyboard (version 2.0 or something) the lags came back. Updated to 2.02, still lagging. I turned off all LCD programs (the g15 has a small LCD which displays a lot of useless information) which lead to a stable game. After that I could activate all the LCD programs again and the lag didnt return.

I just answered to my own problem in case anybody buys the g15 and run into the same problems.