Is there a way to adjust/lower XP rates?

Hi guys, having a blast on this private server, it would be absolutely amazing if i could lower my xp rates to say x2 or x3, is there a chat function that allows me to do this? i feel x5 is too fast.

Is this possible on this server? Thanks for all your input.

It's not possible to change XP rate. You can only disable gaining experience if you want to stay the same level for longer time.