How many Parts/Unions/MeshParts do you have on that wall?
If you have a lot of Parts there, or Parts behind it that are in the Workspace then you may have lag issues like the one in the video.
What are your Studio Graphics settings at? If you lower them from 21 then you may have better performance.
Not that many?
I see all the parts in what looks like a store, the leafy vines, the Neon Unions, the decals, the smoke effect.
Don’t forget that everything in the camera view and behind those Parts are being calculated physically and being Rendered as well.
In the part of the video with the second Scaled Part you have “not that many parts”.
I removed the vines and still have same issue. I mean is that really how limited the engine is?
Like this really isn’t that complicated what I’ve made here. And shouldn’t it only be rendering what is visible to the user? In this case not exactly all that much.
How many Parts (best guess) are in that area? If you have a ton of Parts in a small area as I and @Limited_Unique mentioned then yes, Studio and the game may lag.
Unions can have more of an effect since they are pretty messy Meshes with all their build history in them.
Also it could be your computer having issues with lag too.