Should i use union or part to tweens multiple object?

While creating a fancy door. I stumbled to a a tough choice whether i should use union to tween multiple object to one direction or just leave it as a part but use tons of weld. Which one of them is the best for game performance? People said i should refrain from using union. But to me, it does looks more effective than welding a part to a main part just to tween it in this case.

“What are you asking for?” : Should i use union or weld to tween door?

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If you export then re-import all of those parts you can create a mesh with is by far the best for both preformance and load-bearing.

The problem is i can’t use blender. Both because i do not know how to use it and my device do not support it. So turning it into a mesh is a trouble step for me.

in my opinion i think that unions would be the way to go, since it takes lesss time and the game only lags when theres a lot of diffrent unions, if theres one union diffrent union or a lot of the same union it shouldnt be a problam, but im not a professinal so others might have better advice

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If you export those parts and make them an .obj file in Roblox studio you can import that file into a meshpart.

Here’s a good video on the subject, this is what I do all the time.