Jim keep in mind the CAN network (Star buss) in the car is narrow in bandwidth and all the modules in the car are always using that bus to exchange information thus if you flood it with OBD-II data that gives less bandwidth for the functional data to get on the bus.
Also of course flooding the PCM with OBD-II requests takes clock time away to do its main tasks.
With Ease if Warp speed is off then the scanner requests are every 100 mSecs which is the SAE standard.
Now you can setup warp to request every 50 or 25 mSecs.
Clearly you can see then if you have warp off then requests are about 10 frames a second and 25 mSec would bring that up to 40 frames a second, 50 mSec is 20 F/ps.
I'd say do not use 40 F/ps when asking for like 25 plus PIDs while doing a run down drag strip, use 50 mSec instead or drop down to like 12 PIDs when using 25 mSec.
Of course if engine is only at idle or normal driving speeds there would not be much of an issue as if having engine and PCM very busy at high speeds.
I see no reason as a norm to be using 25 mSecs, 40 F/ps but if its needed just use common sense as when its used and do not be asking for 20 to 40 PIDs concurrently when PCM is very busy at high RPM tests.
