Really fast way to check if something is a BasePart

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#1

I have a VERY tight loop that runs on the entire Roblox world every RenderStepped. It’s seriously tight and it’s lagging the game. I need it to be faster.

One of the bottlenecks are IsA checks to see which things are BaseParts. So I need a really fast way to check if something is a BasePart. Faster than IsA. My loop takes 2 or 3 milliseconds with no code in it except for an IsA check.

Any ideas? I’m going to try adding an extra lookup table to store BaseParts if I can’t make polling faster.

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#2

Uh… why? From what I understand, RenderStepped is meant to be used for things like the camera.

EDIT: If you paste your code, we can try to help you optimize it / find a better way to do what you’re trying to accomplish.

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#3

Are you dealing with general regions in space, like using a Region3? Or is this just under some specific objects that you are checking?

#4

It is a camera, in a certain sense. It’s actually a clone of workspace that I’m trying to keep in sync with the real one.

The entirety of workspace, every frame.

Got any ideas for faster IsA check?

#5

You might be able to use tags on the parts you are looking for. Just tag each basepart with a certain tag you are looking for and that should be faster I think.

#6

All the details you need should be in the post. Take a look at this; this is basically it.

	for i, part in pairs(workspace:GetDescendants()) do
		if part:IsA('BasePart') then
			-- ... 
			-- This if statement was empty for my benchmark.
		end
	end
#7

I’m looking for every BasePart in workspace. Indiscriminately.

It’s a bit more complex than that because I’m not actually looping through workspace’s descendants (else a lookup table would be lots faster), but rather a lookup table mapping workspace instances to clone instances. There are more than BaseParts in there so that Humanoids display correctly and etc.

I’m essentially displaying Workspace in a viewport frame.

#8

But can you not tag every basepart? I’ve never used tags before but I imagine that it should be possible to do that. Even if you instance new baseparts, I’m pretty sure you can still tag them.

#9

If it’s lagging I’d assume it’s because you’re running an iterator with such a costly method :GetDescendants() 60 times per second…I don’t think optimizing how you determine if a part is a BasePart would help anything, unless I misunderstood your original post.

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#10

No, I’m not. I’m using pairs with a lookup table already populated with instance → clone pairs. I’m not actually running GetDescendants.

If you want my code so badly then here you go. I tried to give you all the information you needed.

	for part, clone in pairs(self.WorldLookupA) do
		if part:IsA('BasePart') then
			-- nothing for the benchmark
		end
	end

The loop takes 2ms with a single function call in it :stuck_out_tongue:

Optimizing the function call is my goal.

#11

Why not use ipairs which is faster?

#12

Why not store the returned value of :IsA once in a dictionary with the key being the part in the current iteration? That way you only have to call it once.

#13

Instance pairs? LMAO

No, ipairs only loops through numerical keys.

#14

I ended up using a lookup table to store all BaseParts so I don’t have to do any checking. The BasePart lookup table gets populated when the clones are created, and only once.

Thank you all for your input.

#15

my bad i didn’t realize you weren’t using :GetDescendants() directly

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