As its been the holidays my SMP server has been getting more active with player counts around 20-30 but the server is starting to lag at even 22 players when it used to be able to do 30 players at 20 TPS back in September on the same hardware. I've fiddled around with some optimisations such as reducing the per player mob cap but nothing seems to work. Any advice would be apricated :))
The world is pre generated. 8 Dedicated Logical Cores (5950x) 32GB DDR4