I am noticing a some delay directly after logging in (chat delay, block update, block placement/interactions) and later when teleporting to certain locations with many resources and chiselled blocks (such as towns Sherton, Serenity...). Those give me slight delay in chat.
Also the dynmap (especially in 3D surface mode, which is default) randomly freezes for me almost instantly after it finished loading.
Performed the test and got this result:
Spoiler!
Values remained the same after 15 mins.
TPS are stabilized at 20.
