Editing freezes or glitches with a 48 minute video

I’ve created a 48 minute 1.07 GB video with added video track overlays. As I got past about 30 minutes of editing the process became slow. When I hit pause or or even try and slide the time bar around, the original track will keep going for awhile, but the B- roll (second track) freezes, or the whole thing just stops or gets jerky and I get a shotcut not responding notice. I tried a new shorter video and it was fine.
Thoughts?

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