Trying to cover all my bases on the headline LOL.
I confirmed LACT was installed, though I don’t think that has anything to do with it.
Installed movit via RPM-OStree.
GPU processing is still grayed out. Currently waiting for a 20 minute video to process on CPU only and says it will take 3 hours :(
What render settings are you using? Kdenlive doesn’t use Movit for rendering but rather Melt. You can try AMD VAAPI under Hardware Accelerated in the Render menu. Some other tweaks you can do include enabling Parallel Processing (for your CPU, it can go up to 8), changing Custom Quality, and changing Encoder Speed (though the last two options do affect quality so experiment with what works for you)
Related Kdenlive Documentation