How to wait without pausing entire script

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#1 
run.RenderStepped:Connect(function()
 -- there was code here which i removed for convenience
	if mouse.Target and mouse.Target:FindFirstChild("AttachmentHighlight") then
		mouse.Target.AttachmentHighlight.Enabled = true
		repeat task.wait() until not mouse.Target:FindFirstChild("AttachmentHighlight")
	end
end)

I made a script for weapon attachments which enables a highlight when the player’s mouse is on the attachment. I want the highlight to turn back off when the player takes their mouse off the attachment.

What I would normally do is:

repeat task.wait() until not mouse.Target:FindFirstChild("AttachmentHighlight")

The issue with this is task.wait() pauses the entire script, and I wouldn’t have a way to refer to the highlight after the loop is finished. I can’t use delay(time, function) because it’s not a set amount of time

#2

Simple but it is not recommended to have many loops

task.spawn(function()
	repeat task.wait() until not mouse.Target:FindFirstChild("AttachmentHighlight")
	-- Code
end)

Difficult but better for performance

run.RenderStepped:Connect(function()
	local AttachmentHighlight = mouse.Target:FindFirstChild("AttachmentHighlight")
	if mouse.Target and AttachmentHighlight then
		AttachmentHighlight.Enabled = true
		
		local Connection = nil
		Connection = mouse.Target.ChildRemoved:Connect(function(Object)
			if Object ~= AttachmentHighlight then		return		end
			Connection:Disconnect()
			-- Code
		end)
	end
end)
#3

The AttachmentHighlight is never removed, it’s just enabled and disabled based off it’s enabled property, so this event would never run when the attachment highlight is unselected

#4

I’ll just use this for now since I have to get going soon, this could provide a temporary fix. Efficiency is the least of my worries, if you had saw the rest of my script, you would know why :skull:

Anyways, I’ll mark this as a solution for now. Thank you for your help