Problems adding users

Started using jelly last night and tried to add users but it seems to hang with the loading icon after I click save.
Tried this morning and first attempted worked instantly but second user hung again.

I read that jelly uses sql light would it be possible for me to use wirh mysql instead or is that not a option?
I ask because I’m guessing it could partly be sql light causing the very slow responce?

Everything els seems to work fine.

Thanks in advance