iterations without coroutines?

So far I have a projectile system that when shooting a bullet, ->creates a coroutine ->>The coroutine then creates the Projectile -->The coroutine then also casts rays infront of the projectile --->it moves it if it can

A unique coroutine is made for every bullet, but after shooting for a while, there is a huge drop in frames, but it only ever happens when I am firing bullets.

Is there any other method I could use to help me simulate projectiles in this way? Because I'd like to avoid the lag spikes as much as I can.

StarterPlayerScripts -MainScript --BulletModule;

local Camera = game.Workspace.CurrentCamera
local module = {}
local Player = game.Players.LocalPlayer

function CAST(start,targ,ign)
    local dir = (targ - start).unit
    local newray = Ray.new(start,dir.unit*50)
    local hit,pos = game.Workspace:FindPartOnRay(newray,ign)
    return hit,pos
end

function Collide(Part,Position,dam,Bull)
    if Part:IsDescendantOf(Player.Character)~=true and Part.Parent:findFirstChild("Humanoid") then
        local human = Part.Parent:findFirstChild("Humanoid")
        if human then
            print(Part.Name)
            --human:TakeDamage(dam)
            local K = Instance.new("Vector3Value")
            K.Value = ((Bull.CFrame*CFrame.new(0,0,-100)).p-Bull.Position).unit
            print(K.Value)
            K.Name = "Kill"
            K.Parent = Part
            human.Health = human.Health - dam
            game.Debris:AddItem(K,.3)
            if human.Health == 0 then
                if Part.Name == "Head" then
                    Part.Transparency = 1
                    Part.Decal:remove()
                    local Blud = script.Blud:clone()
                    Blud.Parent = Part
                end
            end
        else

        end
    end
end

function Bullet(start,target,INFO,ignore)
    local ProjInfo = {}
    local function SetupProj(Config,Default)
        if INFO[Config] then
            ProjInfo[Config] = INFO[Config]
        else
            ProjInfo[Config] = Default
        end
    end
    SetupProj("SPD",100)
    SetupProj("DMG",10)
    SetupProj("TYP","Bullet")
    SetupProj("DROP",-.01)
    SetupProj("SPR",3)
    local hitthing
    local dir =             (target - start).unit
    local collide =         nil
    local collidePos =         nil
    local collideSurf =     nil
    local distance =         (target - start).magnitude
    local length =             ProjInfo.SPD/20
    local rayPart
    local Sound
    local Light
    local Trail
    if ProjInfo.TYP == "Bullet" then
    rayPart =         Instance.new("Part")
rayPart.Name = "RayPart"
rayPart.BrickColor = BrickColor.new("Bright yellow")
rayPart.Transparency = 0.3
rayPart.Anchored = true
rayPart.CanCollide = false
rayPart.TopSurface = Enum.SurfaceType.Smooth
rayPart.BottomSurface = Enum.SurfaceType.Smooth
rayPart.Material =         "Neon"
rayPart.Size =             Vector3.new(.2, .2, 2.8)
    rayPart.Parent =         Camera
    Trail =                 script.Trail:clone()
    Trail.Parent =             rayPart
    Sound =                 script.Sound:clone()
    Sound.Parent =             rayPart
    Light =             Instance.new("PointLight",rayPart)
    Light.Color =         Color3.new(206/255,80/255,8/255)
    elseif script:findFirstChild(ProjInfo.TYP) then
        rayPart = script:findFirstChild(ProjInfo.TYP):clone()
        rayPart.Parent = Camera
        Trail = rayPart:findFirstChild("Trail")
        Sound = rayPart:findFirstChild("Sound")
        Light = rayPart:findFirstChild("Light")
    end
    rayPart.CFrame =         CFrame.new(start,target+Vector3.new(math.random(-ProjInfo.SPR,ProjInfo.SPR),math.random(-ProjInfo.SPR,ProjInfo.SPR),math.random(-ProjInfo.SPR,ProjInfo.SPR)))
    Sound.Pitch =             1+(math.random(-4,4)/10)
    Sound:Play()
    local prevPosition =     start
    local KillBull = coroutine.wrap(function()
            wait(3)
            rayPart.Anchored = true
            rayPart.Transparency = 1
            Trail.Enabled = false
            Light.Enabled = false
            if rayPart:findFirstChild("Out") then
                rayPart.Out:Play()
            end
            game:GetService("Debris"):AddItem(rayPart,2)
    end)
    KillBull()
        if (distance > length) then
            repeat
                local bulletFront = (rayPart.CFrame * CFrame.new(0, 0, -1)).p
                local dir = (bulletFront - rayPart.CFrame.p).unit
                local position = prevPosition + (dir * length)
                local hit, endPos = CAST(rayPart.CFrame.p, bulletFront, ignore)
                local newDistance = (endPos - prevPosition).magnitude
                collidePos = endPos
                collide = hit
                if (newDistance < length) then
                    --break
                    hitthing = true
                end
                local bulletDistance = (position - prevPosition).magnitude
                rayPart.CFrame = CFrame.new(prevPosition, position) * CFrame.new(0, 0, -bulletDistance / 2)*CFrame.Angles(math.rad(ProjInfo.DROP),math.rad(-0),math.rad(-0))
                prevPosition = position
                game:service'RunService'.RenderStepped:wait()
            until hitthing == true or rayPart == nil or rayPart.Parent == nil
        if rayPart then
            rayPart.Anchored = true
            rayPart.Transparency = 1
            Trail.Enabled = false
            Light.Enabled = false
            if rayPart:findFirstChild("Out") then
                rayPart.Out:Play()
            end
            game:GetService("Debris"):AddItem(rayPart,2)
        end
        else
            local position = prevPosition + (dir * length)
            local hit, endPos, Surface = CAST(start, position, ignore)
            local distance = (endPos - start).magnitude
            local newDistance = (position - start).magnitude
            rayPart.Size = Vector3.new(0.1, 0.1, distance)
            rayPart.CFrame = CFrame.new(start, endPos) * CFrame.new(0, 0, -distance / 2)
            game.Debris:AddItem(rayPart, 0.1)
            collidePos = endPos
            collide = hit
        end
    if rayPart then
        Collide(collide,collidePos,ProjInfo.DMG,rayPart)
    end
end

function module.RAY(start,target,INFO,ignore)
    local shoot = coroutine.wrap((function(start,target,INFO,ignore)
        Bullet(start,target,INFO,ignore)
    end))
        shoot(start,target,INFO,ignore)
end

return module