Server lags / Low TPS

I have a server with a friend for 20 people and when playing for example 12 people and the server has a pretty low TPS and quite begins to lag.
I have already tried tutorials from the Internet, but without a solution …
I searched everywhere, but I found nothing to help …
Would anyone help? I would be very grateful.

Timings :

What kind of hardware are you using?

Here :

Your cpu it’s so slowly for a 1.14 server

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