Attempting to raycast bullet trajectories, what am i doing wrong?

This is my server side script. When I shoot the weapon of choice most of the bullets are laggy. if clicking rapidly, bullets fly at set velocity. My question is, am I able to fix this. Also in the firefunction() how would i code in a player holding the mouse, coding that client side and bringing a boolean over to verify if the player is holding the mouse or not simply doesn't work.

local itemstore = require(game:GetService("ServerScriptService"):WaitForChild("Modules"):WaitForChild("ItemDatabase"))
local RE = game:GetService("ReplicatedStorage"):WaitForChild("Events"):WaitForChild("GunFiredEvent")
local TS = game:GetService("TweenService")
local goal = {}
local guntype = nil
local dmg = nil
local firerate = nil
local magazine = nil
local canfire = nil
local velocity = nil

RE.OnServerEvent:Connect(function(player, tool, weapon, firing, mousepos)
	for i,v in pairs(itemstore.Weapons) do
		print(tostring(i))
		if i == weapon then
			for x,y in pairs(v) do
				-- gather item statistics
				if x == "guntype" then
					guntype = y
					print("Weapon: "..guntype)
				end
				if x == "dmg" then
					dmg = y
					print("Damage: "..dmg)
				end
				if x == "firerate" then
					firerate = y/60
					print("Firerate (in rounds per second): "..firerate)
				end
				if x == "velocity" then
					velocity = y
					print("Velocity (in studs per second): "..velocity)
				end
			end
		end
	end
	firefunction(player, tool, weapon, firing, mousepos)
end)

function firefunction(player, tool, weapon, firing, mousepos)
	--if firing then -- [[Bullethole generation]]
	--	local ray = Ray()
	--	print(player.Name.." has fired weapon: "..weapon)
	--	local x = Instance.new("Part")
	--	x.Position = mouse
	--	x.Parent = workspace
	if firing then --add support for automatic weaponry
		firing = false
		local tip = tool:FindFirstChild("Tip")
		local origin = tip.Position
		local direction = (mousepos - origin).Unit
		local result = workspace:Raycast(origin, direction*100)

		local intersection = result and result.Position or origin + direction*300
		local distance = (origin - intersection).Magnitude

		local bullet = game:GetService("ServerStorage"):WaitForChild("Bullet"):Clone()
		bullet.CFrame = CFrame.new(origin, intersection)*CFrame.new(0,0,-distance)
		bullet.Position = tip.Position
		bullet.Size = Vector3.new(.05,.05,.5)
		bullet.Anchored = true
		bullet.Parent = workspace
		bullet.Touched:Connect(function(hit)
			if hit.Parent.Name ~= weapon and hit.Parent.Name ~= player and hit.Parent.Parent.Name ~= player then
				local hum = hit.Parent:FindFirstChild("Humanoid")
				if hum ~= nil and hum.Parent.Name ~= player then
					hum:TakeDamage(dmg)
				end
			end
		end)
		if mousepos ~= nil then
			goal.Position = mousepos
		else
			goal.Position = origin + direction*300
		end
		local bullettime = distance/velocity
		local tinfo = TweenInfo.new(bullettime)
		local tween = TS:Create(bullet, tinfo, goal)
		tween:Play()
		game:GetService("Debris"):AddItem(bullet, bullettime)
		firing = true
	end
end