So nightwolf just told you literally what basic googling will tell you. That hikari is the best connection pool in terms of performance.
The problem is beyond the cp.
The database structure is wrong, big time. Using a relational database while having fuck all relations is a bigger concern.
The password hashing method is the most basic there is. You can literally google some of the hashes and get the actual pass back.
I also disagree with all the items that got moved in the xmls.
Now every time I wanna make a external tool I have to depend on the gameserver's runtime to provide me the info I need while I could just use a simple query and get everything I need back.
And don't give me the "they are more flexible" thing. They are not.
They can only look more flexible if your sql knowledge is shit.