I'm not really sure sure the above title is even technically accurate...is the refresh rate a function of the port (PS/2 or USB) or the peripheral connected to the port (or both). In any case, I have to consciously slow down and hold my mouse pointer still for a second for anything I click on to actually work. For instance, if I click on a link/button and immediately move the cursor off of it (after I click it and see the link actually get highlighted), the page the link/button is connected to will not open. I'm not talking about lightening fast reflexes here, I really have to hold the mouse pointer still. for it to work. Similarly, if I click on text in a Word document and don't hold the pointer absolutely still while I'm doing it, I end up highlighting a portion of the text. I have 2 Logitech Optical Wheel Mice (2nd generation...supposedly "twice as fast") and they both do the same thing on my IBM laptop.