How to have a build gui without studio crashing/game laag?

I have a script for a simple building gui, however after a while the amount of singals sent causes studio to crash. Anyway to stop this? I tried to have it only run if the position isn't equal, but still the signals were too much. Anyway to fix this? Here is my code:

function BuildMode()
    local buildmode = game.ReplicatedStorage.Value.Value
    if buildmode == false then
	buildmode = true
elseif buildmode == true then
	buildmode = false
end
if buildmode == true then	
    print("Build mode on")
	local player = game.Players.LocalPlayer
	local Mouse = player:GetMouse()
	local pgui = player.PlayerGui
	local a = game.Workspace.BrickWall:Clone()
	a.Transparency = .5
	a.CanCollide = false
	a.Parent = workspace
	Mouse.Move:connect(function()
	if buildmode == true then
	 if Mouse.Target.Name == "Terrain" then
	if a.CFrame ~= Mouse.Hit then
		a.Anchored = false
		a.CFrame = Mouse.Hit
		Mouse.Idle:connect(function()
			if a.Orientation ~= Vector3.new(0,0,0) then
			a.Orientation = Vector3.new(0,0,0)
			wait(.25)
			a.Anchored = true
			end
		end)
	elseif Mouse.Target.Name == a.Name then
		if a.Orientation ~= Mouse.Target.Orientation then
		    a.Orientation = Mouse.Target.Orientation
		    a.Position = Mouse.Target.Position + Vector3.new(0,7.2,0)
		    a.Anchored = true
		end
	end
	end
		Mouse.Button1Down:connect(function()
			local b = a:Clone()
			b.Parent = workspace
			b.Anchored = true
			b.CanCollide = true
			b.Transparency = 0 
			buildmode = false
			
		end)
		end
	end)
end
end

script.Parent.MouseButton1Click:connect(BuildMode)