I've been complaining about this issue since I bought Edit & DVDA on Steam in 2017... if I use any Intel CPU with 6 cores or more, it's completely unusable: crash city.
On Steam Community, I was told:
MAGIX [developer] 4 Oct, 2018 @ 6:55am
there is currently some odd behavior on high-core Intel systems. One troubleshooting step is to switch off Intel Turbo Boost. This can make the program work even with all cores enabled.
Anyways, the development team is aware of the issue and is working on resolving it ASAP.
your MAGIX support
Well, it's now March 2020. Where the #$&*^ is the fix? Nobody has responded since.
I have two 6-core Intel CPUs (these are hardly "high core" these days) that are my main workstations. The only solution is to go into the BIOS and disable any one physical core. Disabling Turbo Boost does not help at all. 8-core AMD processors work fine.