FPS drop in 21w17a with datapack

This issue happens in servers and in singleplayer using the datapack, and other players on the same server have the same issue

 

While playing in the latest snapshot on a server, many FPS drops happen suddenly. In these lags my game freezes for a second or two and then it starts running normally again until the next FPS drop happens.

PS: I had to make the video quality lower in the attachments.