what do you consider to be 'regular' speeds ?

Mine are 75mm/s for fine prin5ting, 100mm's standard prints and 150mm/s for rough but structural.

Only if I'm using flexible filaments do i drop down to 20-30mm/s.
That said I haven't done much with pet-g yet.

I think for something like a mumu I'd probably accept 50mm/s - anything much lower than that and even small multi material prints are going to take an enormously long time.