Sony VAIO laptop keeps displaying spinning circle mouse pointer. This happens every 10-15 seconds and lasts 5 seconds or so.
This doesn't seem to affect computer performance too much, but it could be because was a a hi-spec Core i7 + SSD laptop. Task Manager didn't provide many clues - none of the processes was consuming unusually large chunk of system resources.
Diagnosing was done by disabling and re-enabling application from running on start-up via Sysinternals Autoruns until the offending application was found.
The issue was caused by HP OfficeJet Pro 8600 software running on start-up.
Preventing HP Officejet Pro 8600 (NET) from running on start-up resolved the issue. This disables ability to automatically initiate scan from the printer, but doesn't affect printing or scanning when initiated from the computer.