It has already been significantly decreased from what it was on ShadowCores (45 per second to 30 per second for a promoted mage). For other vocations this was untouched to try to balance the vocations. Our servers aren't meant to be that slow-paced that you should have to wait for mana or resupply too often, it's meant to be fun, and since ShadowCores has a lot of players I'd say a lot of players will agree with me when I say that fast mana regeneration makes it fun to play. Although I will agree that mages are overpowered on ShadowCores; it's not something that can easily be addressed now (not technically, but having the community accept the change when most of them are playing mages because of how strong they are). The decreased mana regeneration when comparing it to ShadowCores, and decreased magic level rate should mean more balanced vocations if anything. If you don't like it I'm sure there are servers out there with lower mana regeneration.