Earlier quoted context omitted.
For me, Shotcut, Openshot, Flowblade, Olive and Pitivi have been crashing to often to be worth using. Openshot used to be less flaky when I used it a few years ago when it was in GTK but the Qt version has not been stable to me. Kdenlive is amazing though, especially the timegraphs for applying effects, and the clip proxying which makes it amazingly smooth for large projects on old laptops. I don't think any of the o…
I had a really bad experience last time I tried to use Kdenlive. Even on a pretty powerful system, having a project timeline longer than an hour made the entire interface run at ~5fps for me when adjusting cuts. After that, I started using DaVinci Resolve, which definitely still has problems, but runs like nothing else I've seen.
Did you use proxy clips? It's not on by default[0].
[0]: https://userbase.kde.org/Kdenlive/Manual/Projects_and_Files/...