I have purchased the paid version of the platform, and I have found it amazing.

However, I'm having a problem with CapCut for desktop, which I hope someone could help me with.

I am using the paid version on the web because I have an old laptop (a MacBook Pro 2013), so I preferred not to install anything because I'm pretty sure it wouldn't work.

However, even on the web version, the videos I have uploaded for editing are lagging too much for me to do any possible editing.

The videos themselves are fine (I have opened them on my Mac and they work), and they have been recorded with a Sony A6400 in 4K NTSC (I live in Germany and I would have used PAL, but there was no way to set 30 fpm with PAL).

Would anyone be able to help me understand what it could be?