I have an XMG P505 with windows 8.1, an i7-4710HQ, nvidia 970m, 20 gigs of ram, 3 hard drives (all SSDs).
My problem is that HitFilm's UI is very slow to react. After opening the tasks manager I found out why that is: the program becomes unresponsive quite often.
I made a screen capture to show it.
Besides that, there is some weird behaviour too, you can see it at about 1:24 when the whole window displaces to the left. This happens randomly.
From 1:38 it is just me being clumsy at closing the recording, could not be bothered to edit it out.
I have put the project file and all the stuff in it here for your perusal.
MOD: I've edited the title of the thread to be more up-to-date with the discussion. Thanks! -Simon