Its most likely caused by your PC although i had this issue once on a game even tho my PC is pretty good.
You could reduce lag by unioning parts that can be unioned or deleting useless models/parts
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Im running a Evga Nvidia Gtx-1060 on a 720p monitor.
I think its my CPU. That may be outdated…?
Its a I-3 4130
I did solve by dividing the map into sections and putting those into server storage
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This happens when you move too many parts at once. Unions should do the job if your parts are the same color and transparency. If it still happens, reinstall Roblox Studio, sometimes the easiest thing to do is the solution.
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Problem persists if i move individual bricks 
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You could set the Priority higher, to do that open the task manager / Processes and right click on Roblox Studio
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I’m still using windows 7 
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This happened to me before, when trying to move objects in a place with either many textures or parts . The fix to this issue would be to try to delete some of the parts in the place. Sometimes, it can be only a few parts causing this issue. Parts that have a very high tri. Or, it could be just your PC - try to have a friend move parts around, and see if it happens for them.
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This Post should not be within this Topic of “Building Support”, and should next time be posted within the #platform-feedback Topic.
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It isn’t a bug. This catagory is fine because the solution involves the parts within the place and is due to the number of parts currently being rendered by the viewport.
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The reason why it is lagging so much is because their is a lot of parts in the game already. I would suggest reducing the amount of parts, it can be done by making meshes or removing un needed parts.
I dont see why i dont lag when im not moving objects.
Why dont i lag when i dont move parts
But i do when i do move a part
I feel as if this is a bug possibly.
But yes, its caused by high amount of parts…
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When you aren’t moving objects your viewpoint doesn’t need to render anything new in. Then when you are moving object your viewpoint needs to render in the parts moving.
Here is a scenario to explain this better:
Imagine you are in a shop with lots of people in it and lots of thing everywhere(Like your game). If you wanted to walk from one side to the other you will have to walk around people and over things, this will take a lot longer than if their was nothing in the shop. This is basically what is happening when you move an object in your game your camera keeps having to render new objects in. Back to the shop scenario, if you are stood still you aren’t trying to get past people and over thing and not doing anything. This is what is happening when you aren’t moving any object in your game. You don’t need to render anything new in because you aren’t doing anything.
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Ahhh, thank you for clearing that up!.
For some reason, in the explorer, folding the workspace (click the small arrow next to it so it hides all the descendants) stops making everything lag when I move a part or when I rotate/move a limb in the animation editor.
This might be your solution.
How many parts are in your game? Is this only when moving things there? If so, you probably have a ton of parts in your game, that’s when this happens to me.
No clue, maybe in the few thousands
The solution is simple, if you’ve got eager bulk execution with a check mark, in rendering, disable it. I’ve just found it out today, had the same issue for about a week. If that doesn’t work then I’ve got no clue man.
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Hello!
This might help
Sorry if it doesn’t 
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I’ve actually experienced this very recently and what fixed it for me was to turn the join surfaces option off. There are many things that could cause FPS drops, but join surfaces can often cause lag, in my case at least.
Edit: I just noticed someone else said something similar, but this response is slightly better phrased than that post in my opinion.
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This actually fixed my problem! Turning off Join Surfaces removed my lag. So what caused my lag as I have developed before? Well, my laptop which is 6 months old decided to fail and get rid of the os and blue screen. I had to reset my whole pc and get the iso for my HP laptop. Once I reinstalled roblox it was laggy when moving parts but after that, turning off join surfaces removed the lag and now I can have graphics up at 21! it fixed my problems! I can go back to developing again without lag.
Thank you!
-Sam
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Unioning parts will not fix lag, it will only make everything a risk for corruption.
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