It's super useful to use the virtual printer when developing plugins. The virtual printer prints pretty fast which is nice. Sometimes I want to tweak the speed of it and also don't want to wait for its virtual hotend to reach temp. Did a little googling but have not found a clear answer.
Heatup speed can't be tweaked, but simulated printing speeds can be increased just like real speeds via F parameters/commands. There's no upper limit (at least no intentional one). You might also want to play around with devel.virtualPrinter.throttle in config.yaml, see also the development settings docs.