I was having a discussion with another admin recently, and he questioned why we were running our process schedulers with Application Engine Server(PSAESRV) enabled. He pointed out that there is very little gained by running PSAESRV, so why have it turned on?
Now, you aren’t completely without loss in turning this off. Depending on what applications you are running and what your system’s needs are, you will have to make that decision for yourself. Check out Doc ID 651970.1 in MOS for a run down on the pros and cons for each method of running App Engines on your process schedulers.