The Forms connector is now nearly instantaneous - you can read more here : https://flow.microsoft.com/blog/building-scratch-forms-responses/
I will vote for this. I am trying to create some simple processes with Forms and the delay in Flow being triggered is too long to make testing and using these viable.
Microsoft recently redesinged how they trigger the forms tap -- I had to rebuild one of my most complex flows because of such! It is pretty much instant now.
Im not seeinmg the incresed speed - I think if you are in the flow viewing it live it does process att he point - But im still seeing the normal 1 up to an hour response on the form poll