Moving a model causes abysmal lag

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#1

Hello everyone. I am trying to simulate a subway train docking at a station. To do so, I move the entire model of the train (which is decently detailed) at a rate that constantly declines, as shown below.

local speed = 1.25

while speed > 0 do
	script.Parent:TranslateBy(Vector3.new(0, 0, speed))
    speed -= 0.001

	game["Run Service"].Heartbeat:Wait()
end

The only problem is that while the code works correctly, my client’s FPS drops significantly while the train is moving. Is there a workaround, or is this just an insurmountable consequence of translating an object of such detail?

#2

you should probably use delta time on slowing it down, also you should not use while loops, use game:GetService(“RunService”).Heartbeat:Connect, saves a instruction, cache the scripts parent, so you dont have to reget it, you should also probably do this on the server. maybe put the script in a actor too? (should improve performance if you use actors)

1 Like
#3

So then, would this be an appropriate use of deltatime? Additionally, I moved the script (and only the script) into an actor that I spawned into Workspace.

local speed = 1.25

while speed > 0 do
	workspace.Train:TranslateBy(Vector3.new(0, 0, speed))
    speed -= 0.001

	local StartingTime = os.clock()
	local DeltaTime1 = game["Run Service"].Heartbeat:Wait()
	local DeltaTime2 = os.clock()-StartingTime
end

I have noticed the framerates improve somewhat, but the sequence is still noticeably laggy. Is there anything else that can be done? I did not understand what you meant by connecting the function to a heartbeat, as that would contradict using any wait functions at all.

#4

No, that would not be a appropriate method of getting delta time, you should use game:GetService(“RunService”).Heartbeat:Connect(function(deltatime), delta time would be used to make sure it stays the same speed every time the train slows down.

1 Like
#5

Try this.

local runService = game:GetService("RunService")

local speed = 1.25

local subway = script.Parent

local connection

local function heartbeat()
    subway:TranslateBy(Vector3.new(0, 0, speed))
    speed -= 0.001
    if speed <= 0 then
        connection:Disconnect()
    end
end

connection = runService.Heartbeat:Connect(heartbeat)
#6

Works; however, still lag. If it’s any help, here are some screenshots of the model itself. Perhaps the problem just lies in the model’s detail.

image
image1432×589 41.5 KB

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image1435×581 58.2 KB

#7

I doubt it, the model is already loaded in, you’re just moving it.

I suppose you could try a tween, but you’ll need an approx. time to stop and end CFrame goal.

local tweenService = game:GetService("TweenService")

local subway = script.Parent

local tweenInfo = TweenInfo.new(
    5, -- Approx. time to stop
    Enum.EasingStyle.Quad,
    Enum.EasingStyle.Out
)

local tween = tweenService:Create(
    subway,
    tweenInfo,
    {WorldPivot = CFrame.new(0, 0, 0)} -- End goal CFrame
)

-- To play tween
tween:Play()

Edit 1: Changed easing style, you probably want to play around with the easing style to figure out which one is best for you

1 Like
#8

For whatever reason, the train appears to be completely immobile. The console shows nothing.

Additionally (although this may be an entirely separate bug/issue), the model’s pivot point is way off of where it should be.
image