Does unioning parts really reduce lag?

I have seen multiple people say that unioning parts does help reduce lag within your game, but also people on the other side, who say that unioning parts does nothing. Can I get everyone’s opinion on that?

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maybe it does cause hit boxes are wierder

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If yours unions aren’t big models or you’re using default (or lighter collisions e.g: box, hull) they will not deal much stress, but if they are - according to roblox docs:

PreciseConvexDecomposition — Offers the most precise fidelity but still not a 1:1 representation of the visual. This option has the most expensive performance cost and takes longer for the engine to compute…

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If you are unioning a lot of parts, then yes. If you are unioning not so many parts into something complex, then maybe not.
And collision. Sometimes precise one won`t save you…

pretty sure it’s actually quite the opposite lol, avoid unions at all costs

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