High CPU and RAM usage

Before 1.8 update i was able to play with 4 players on my server with an map without any issue, and now not even with 1 player because it crashs after 5/10 mins. Server is always at 100% on CPU and RAM now.

I already tried to generate a new map and my RAM is always at 100% just with one player but CPU didnt rise like the other map.