Even if the server allows it, your connection becomes desynced. On your screen, you are hitting the MVP 50 times. On the server, you have only hit 5 times because the other 45 packets were dropped as "invalid states." You will die to a monster that appears to be "standing still" on your screen.
By extracting, editing, and repacking (or loading) a custom GRF, you can theoretically change how your client processes delays. no delay grf ragnarok hot
Before downloading any "Pre-made No Delay HOT GRF" from a random forum link, scan it for malware. Hackers love packaging trojans inside these modified game files. Your RO character isn't worth your Windows installation. Even if the server allows it, your connection
Here's a quick breakdown of what that means: Even if the server allows it