Turn up mouse sensitivity. If it's not in the options menu of the game (F1) or options from main menu), then take a peek in your windows install, control panel, mouse, pointer speed.

Of course, graphics lag can appear as slow mouse movement (or delayed), as well as memory issues (not positive on memory by the way - just guessing) - so what specs you running etc.

I'm running on minimum detail.

The mouse delay I'm talking about is mostly during the periods when you get a pointer. (such as the entry screen, and on-planet screens)

I'm running it in a window with 1024x768 (Widescreen laptop, so can't run fullscreen without streching) resolution

Had that too on a regular basis with my old Logitech MX 510 / 518. Make sure mouse acceleration is turned off in your mouse driver. Generally speaking, it is better to let windows handle the mouse's primary functions that the vendor's driver.

You might also consider to tweak your mouse a bit, if it's plugged in via USB. You then can raise the USB pollrate (standard = 120hz) up to insanely high levels (around 2000hz). However, it might happen that your other USB hardware doesn't like such high pollrates and start to malfunction. Trial & error on this one, I'm afraid.