I have "hopefully" solved the problem temporarily ... there is something wrong with my internet connection since i moved the router, but now i have a cable lying around my apartment so it should be working, and better than before ... server online again.
Fixed:
* Formulas of haste to be based on the ones tibia is using (Now there is not a steep difference from 50 to 51)
* Server haven't crashed today, it might be solved but if it's not, i think i know what is causing it, and then i'll remove that part completely til i find better fix for it
To fix:
* correct duration of haste spells for 7.7 (can't find source of it ...)
* Server save system (not done yet ...)
And after a long talk with a player yesterday, i realized i must give in to the community. if you feel like something should be changed, experience gain/loss, new maps/customize the current maps, please write your opinions here. it will help me alot !