Having several problems with Premiere Pro

I had recently edited a 15-minute video on my phone, which ran it fine. But when I started editing it on Premiere Pro on my computer, I started having some issues that make editing almost impossible. When I open a project some panels won't load for a long time, the timeline won't show any changes I make, it won't let me zoom or move around the timeline, some windows won't even open, and I can't switch to any other tabs like Audio or Effects. I can still play what I have in the timeline, but that takes like a minute to "render." All of these issues persist no matter the length, the amount of edits I made, or if it's originally a Premiere Rush project or not. What can I do?

I've also had another weird problem, when I open a Premiere Rush project with only two audio tracks, it will automatically create about thirty extras. It's not really a problem, but it'd still be nice to know why.