@niqoar Have you been reloading your server a lot? I recommend completely stopping it and starting it up again as many plugins aren't well made and create memory leaks across reloads.
@Gerov 40 in total, multiverse, worldedit, jobs, quickshop, essentials, basic plugins. Approximately 30 players. @Mrs. bwfctower The reload is used only when plugins are tested. Then reboot the server.