If you're using so many tasks that the AMXX core itself has trouble executing them a small player loop is your least concern. In the general way he has asked this question it is diffcult (if not wrong) to advise him on any particular performance issues at all.
Constantly spelling out these worst-case scenarios only drives coders to do pointless optimizations and write bad code as a result.
The only answer here is: Use the right tool for the job, don't worry about minute performance differences.