Why is my NPC's Movement's So Laggy?

Basically what I'm doing is having the npc chase the closest player, it works fine, however the movements are super choppy and it just looks very bad, anyone know why this is?

--Services
local players = game:GetService("Players")
local ps = game:GetService("PathfindingService")
local runserv = game:GetService("RunService")

--Asset Variables
local staff = script.Parent
local staffHum = staff.Humanoid
local staffHRP = staff.HumanoidRootPart

--Find Destination(The Closest Player)
local function findClosestPlayer()
	local closestPlayer 
	local closestMag = 50
	for _, player in pairs(players:GetPlayers()) do
		if player.Character then
			local playerHRP = player.Character:FindFirstChild("HumanoidRootPart")
			if playerHRP then
				local mag = (staffHRP.Position - playerHRP.Position).Magnitude
				if mag < closestMag then
					closestPlayer = player.Character
					closestMag = mag
				end
			end
		end
	end
	if closestPlayer then
		return closestPlayer
	end
end

local function chaseClosestPlayer()
	--Pathfinding
	local dest = findClosestPlayer()
	local path = ps:CreatePath()
	if dest ~= nil then
		path:ComputeAsync(staffHRP.Position, dest.PrimaryPart.Position)
		local waypoints = path:GetWaypoints()
		for _, waypoint in pairs(waypoints) do
			staffHum:MoveTo(waypoint.Position)
			staffHum.MoveToFinished:Wait()
		end
	end
end

runserv.Heartbeat:Connect(chaseClosestPlayer)