My game occasionally runs at 30fps with a 60fps setting

My 4 * 4 chip has a capacity of up to 2.5GHz and looks like the CPU is also very easy, but when set to 60fps, playing games on the same map sometimes results in 30fps.

1. It's not in the game hall or player animation interface, but after the kickoff in the game (the screenshots in the attachment are all pieced together from several rounds of data after kickoff)
2. My chip is fully capable of supporting smooth game operation at 60fps
3. I confirm that my machine does not have a frame limiting solution for this game, and the temperature of my phone is also very low
4. Most of the time, it can run at 60fps, but occasionally there may be a situation where it runs at 30fps, and it is uncertain which round it will be. It could be the first/third round, or the eighth round

I had the bill of lading 200299902 yesterday, but in today's version 24.0.02, my issue has not been resolved. Please tell me the basis for frame limiting on the game side?

Looking forward to your reply very much

Thanks.