My toilet tank fills back up super slowly

Weird issue I’ve never had before. In short, I flush my toilet, then the tank starts filling up with water at an extremely slow pace. My current fix for this is that after the flush, I switch off the water flow of the toilet for about an hour. After that hour passes, I turn it back on and it fills back up normally. It’s not the end of the world, but just a slight inconvenience I’d like to fix. What’s causing this in the first place?