Server suddenly has really bad TPS after 1.21 update.

Hi, I updated my server from Paper 1.20.4 to Paper 1.21, and the TPS went from almost always 20, to now sitting around 11.
It appears to be coming from entities, but I haven't increased the number of entities. So has it gotten less efficient?
Thanks in advance!
https://spark.lucko.me/LPstPdfUZv