<b>brento73</b>,
I have two optical mice, one Logitech and one generic. They both have the dimming light intensity. As far as I know, this is standard to all optical mice, and I don't believe is the source of your problem. Mine seemed to respond immediately when moved, except during hi-res games, but I believe that is a processing/graphics issue. I do, however, have a response problem of a different nature.
I have a Logitech iFeel Mouseman. It is the first mouse I have used that actually is shaped to fit the most comfortable hand position for me (plus, I found it dirt cheap). It also has "sticky" rubber sides which really helps when I run out of padspace and have to "relocate". These are two issues which I had with my older generic opti mouse which I took to work to get rid of the stuck ball issue. (Too many issues!)
I have it set up to a pretty high speed, especially since I am at 1024x768 and using a small mousepad (with a really nice gel wristrest). What happens to me is sometimes the pointer moves really slow. Then, when I open a window or close a program, it jumps to the set speed. This happens many times during each session. It drives me bonkers!
The pointer also generally moves slow during games.
I have upgraded to the newest Logitech drivers and that hasn't helped. <font color=red>Aside from chucking it out the window, does anybody know what I can do? Are there any known issues?</font color=red>
One more thing, the vibrator seems to turn itself off after only a few minutes of use. OK, OK . . . it is a funky feature that I usually turn off, but WTF?!? I also downloaded the newest Immersion drivers and no dice.
<font color=red>Could this be a PSU issue?</font color=red> I am planning on upgrading soon (b-day in April), but I don't know if I can wait!
<font color=red>Could it be that the one I bought is junk and I need to exchange it?</font color=red>
Please advise.
VSP
<i>Thoughts are thinking; Thunk from knowing
<b>nwod</b> gniog em peek reverof sthguohT</i>