How many anchored, textured parts can a roblox server handle, and how would it work with streaming enabled

I am hoping someone already have done some tests on this and can give me some pointers. How many anchored parts can the server handle when streaming is enabled?

For example: say I got 50.000 parts scattered around on a huge map, and those gotta be streamed to 50+ players at different moments, at what moment does it begin to lag to much?