[Indarello]

public OnPluginStart()
{
	HookEvent("weapon_reload", weapon_reload);
}

public weapon_reload(Handle:event, const String:name[], bool:silent)
{
	new client = GetClientOfUserId(GetEventInt(event, "userid"));
	
	new weapon = GetEntPropEnt(client, Prop_Data, "m_hActiveWeapon");
	new Float:curtime = GetGameTime();
	new Float:nexttime = GetEntPropFloat(weapon, Prop_Send, "m_flNextPrimaryAttack");
	nexttime -= curtime;
	nexttime *= 1.0/4.0;
	nexttime += curtime;

	SetEntPropFloat(weapon, Prop_Send, "m_flNextPrimaryAttack", nexttime);
	SetEntPropFloat(client, Prop_Send, "m_flNextAttack", nexttime);
}

this code make reload speed x4 faster, but how make reload animation x4 faster or stop when reload ends

[fiction]

You can do this by modifying the m_flPlaybackRate of the player's view-model and the weapon itself, take a look at how it's handled in SM:RPG.

[Indarello]

		SetEntPropFloat(weapon, Prop_Send, "m_flPlaybackRate", reloadmodify[client]);
		new iViewModel = GetEntPropEnt(client, Prop_Send, "m_hViewModel");
		if(iViewModel != INVALID_ENT_REFERENCE) SetEntPropFloat(iViewModel, Prop_Send, "m_flPlaybackRate", reloadmodify[client]);
		SetEntPropFloat(weapon, Prop_Send, "m_flTimeWeaponIdle", nexttime);

what about world animation?