Open your data.grf with GRF Editor. Navigate to the following directories and extract them to your Ragnarok folder:

In default Ragnarok Online , skill usage is governed by three factors:

To create "No Delay," change the second number to 10 (milliseconds). 129,0,1000,10,0,0,0,0,0,no //HP_ASSUMPTIO

: Some servers mitigate this by matching animation delays server-side, rendering client-side GRF edits ineffective. Hercules Board Technical Details GRF Archive

Most official and some private servers (like those using Gepard Shield or EAC) consider "No Delay" edits a bannable offense because they provide a mechanical advantage. Always verify your server's "Terms of Service" before using them!