100% CPU Usage

Hi. Ever since the new Nether Update came out, I noticed a bunch of lags in my world. Nothing even remotely close to that has ever happened, and now my game doesn't render any textures for about 15 seconds when I enter a world, and it hits 100% CPU pretty much all the time, even though before the new update it would be just around 40%. Plus the game feels very laggy because of that, and the camera some times just freeze in place when I'm moving the character.

My current pc specifications are:

processor: intel core i7-8700K CPU @ 3.70GHz

RAM: 16.0 GB

Graphics Card: NVIDIA GeForce RTX 2060