Low TPS from what?

Hi everyone, Can somebody help with low TPS. Entities, players and loaded chunks are almost same at 13 and 19-20 TPS but something happen and TPS drop down all day to 9-13 TPS…

Timings: https://timings.aikar.co/?id=4a3cbdc62c294ac0a1ed366e8b0800be

Sorry for my bad english. Thanks in advance!