bug freezes a few seconds

after i update minecraft to the latest version 1.21.81

and I tried Vibrant Visual, created a new world and ran it I experienced a freeze bug for a few seconds, this is not lag but like minecraft stops for a few seconds then starts again I understand this is an experimental feature

I tested again but did not use the experimental feature or vibrant visual only using the regular resource pack in the marketplace and I tried to run it to create a new world, but the result was the same as experiencing a freeze bug as I explained above

Before I used the latest version, in version 1.21.80 I did not experience a freeze bug like this. it really interferes with the game please Mojang update it again