I thought i found a great server

So i went onto this server like right when he started it. He let me on to test some plugins he had installed. Well because of that, i am now the co-owner of the server! One problem though... IT LAGS SOO MUCH! He said if he would get donations that he would pay someone to run the server for him (some company i cant remember the name of). So ya i thought it was awesome until i saw the lag:(