I am just playing around to test some things. If it can help to discover here and there some parts not working well I guess it could help.
In my logs the 5 sec time is more related to Gm#, :GX90# and :GX96# but the issue is for sure (but I may be wrong) related to the driver itself not to OnStep.
I will try to investigate around that.
Now one thing is sure, OnStepX is far from "production" state but looks very promising.
I experienced also a lot of thing and reported to Howard and he fixed vert quickly.
But here it is really Indi Driver related I believe.