I’ve had a lot of fun with the new Highlight class, and wanted to make a Vector-looking wireframe game, but for some reason, Highlight seems to not work properly if more than a few dozen parts have it in one place, unsure why this is happening, does anyone have a solution?
This is intentional. Not sure why though. You can fix this by just putting the highlight in a model, and have all your parts in there.
Having models being highlighted doesn’t achieve the same effect, it highlights all models as if they’re unions. 
Really hope Roblox does something about this, Highlight holds a lot of potential.
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Try ungrouping everything. If that doesn’t work, unfortunately, there’s no way around that… 
Apparently intentional, or at the very least this bug has been known about since highlights released and there’s been seemingly nothing done or said about it. There is no workaround.