Online on Source !!

How Can I Know If The Souce Have The Ability To have Much Online ??
Cuz I tried some but they when online 60 !!
Some Problem Appears like no one can log in again
Monster Disappeared
No Stamina !!

so how can i know that before upload to vps !!

delete the source and write something worth using.

No, seriously. That's just demonstrating that the source is very poorly written and falls apart under any small level of strain.

To salvage the existing source you'd have to re-write most of the core systems (thread safe collections, possibly new socket system, new threading system, re-write all logic, etc)