A user has reported a stuttering issue in Windows 7; the default "busy" mouse cursor stutters a little during its animation loop, just before the shining highlight returns to the 12 o’clock position, skipping a beat somewhere around “11” on the clock face. The same cursor in Windows Vista is OK. “The Windows 7 cursor’s designed to display each frame for 3 “jiffies” (1/60 of a second) whereas the Vista cursor displays each frame for 2 jiffies. If this stutter bugs you, a simple fix is to use Vista cursor, just copy cursor file to “%SYSTEMROOT%\Cursors” and configure your “Pointer” settings from the “Mouse” control panel,” reported.

Windows 7 “busy” cursor           Windows Vista “busy” cursor