This report examines the use of "No Delay" GRF (Graphical Resource File) modifications in Ragnarok Online
In short:
However, the "No Delay GRF" operates in a grey area. It does not inject packets; it optimizes the timing of packet transmission. By removing the visual delay, the player sends packets at the precise moment the server cooldown expires, achieving "perfect" efficiency that is humanly impossible with standard animations. no delay grf ragnarok hot