It doesn't matter what device I use, Rush can't keep up

I have been trying to add a voice over to a 45 second long video for 3 days now. I started on my laptop, a less than 1 years old Lenovo Yoga 7, with the fully updated software. I got as far as editing the clips, and when I added transitions, Rush just refused to give me anymore playback. I remove the transitions but it still won't load my video. At best, I get buffering frames 10 seconds apart. Frustrating, but I can pivot. I try editing on my brand new Google Pixel 8 pro, with a fully updated Rush App. Same problem. No playback, only the occasional buffer. I try on a different Wifi network. Nope. No playback for me. I get on my partners $3k gaming PC. And you guessed it, Rush just cannot show me the video I spent 4 hours making and editing. So now I have 3 projects that just won't load, and I get the pleasure of redoing all my work over on CapCut. This, paired with no longer providing sync support, is the reason why I'm cancelling my Adobe subscription and finding other services that can actually give me a reliable platform to do my work on 🙂