Trying to fix a slight delay that occurs with key bindings

[Tcjenkens]

So I am playing Diablo 2. Typically you cast abilities using the right mouse click. I have used ahk so that I can press keyboard keys and it will cast abilities instead. Also if you hold the key down it will repeatedly cast the ability. What the issue is, is when I hold the key down to repeatedly cast the ability it does an initial ability cast, pauses briefly, then precedes to spam the ability without pause. Is there a reason there is an initial pause.

This is my code.

#NoEnv ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn ; Enable warnings to assist with detecting common errors.
SendMode Input ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir% ; Ensures a consistent starting directory.

; Press the Q key and click and un-click the right mouse button
Q::
if ( not GetKeyState("RButton" , "P") )
Send {Q}
Sleep, 0
Click down right
Click up right
return

; Press the W key and click and un-click the right mouse button
W::
if ( not GetKeyState("RButton" , "P") )
Send {W}
Sleep, 0
Click down right
Click up right
return

; Press the E key and click and un-click the right mouse button
E::
if ( not GetKeyState("RButton" , "P") )
Send {E}
Sleep, 0
Click down right
Click up right
return

F1::Suspend ; F1 hotkey to toggle hotkeys on and off
return

[evilC]

The initial pause is caused by key repeat.
Go into notepad, hold any key and observe what happens.
You get one key immediately, followed by a slight pause, then it repeats quite quickly
If you want to get rid of the initial pause, you need to completely rewrite the script and use SetTimer instead