Why is there slight lag in my script? Part touches but takes a bit to register.

script.Parent.Touched:Connect(function(Hit)
	if Hit.Name ~= "Part" then
	for i = 1, 10 do
		local ExpPart = Instance.new("Part",workspace)
		ExpPart.Size = Vector3.new(2,2,2)
		ExpPart.Position = script.Parent.Position
		ExpPart.Velocity = Vector3.new(math.random(20, 50), math.random(30,100),math.random(20,50)) 
		ExpPart.CanCollide = false
		ExpPart.Material = Enum.Material.Slate
	 	end
	script.Parent:Destroy()
	end
end)

What happens is, all the parts stay in the center for around 200 ms, then they fly with their velocity. How do I lower that delay?

I think it's a for i = 1, 10 do issue i have had the problem as well. Sorry i can't fix.