Extreme performance loss when streaming out instances

My game currently uses StreamingEnabled with Opportunistic mode. We aren’t using any Atomic models. When moving across the map and parts are being streamed out, there are massive lag spikes.

It’s occurring on both of these games:
https://www.roblox.com/games/570460315/Broadview-County-1997
https://www.roblox.com/games/8605092891/Broadview-2-0-Development

Expected behavior

Streaming out parts should not block the main thread, nor should it take this much frame time (20ms! for several frames)

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