Zooming in to a construction project drops the FPS by a large degree

[Jalmari Ikävalko]

Zooming to a project under construction drops the FPS, in my case from 150-200 to 40-80. ZK and BA are affected as well, but not as strongly.

/luarules disable and /luaui disable, while otherwise increasing FPS, didn't affect the strength of the drop - the FPS ratio between zoomed in and zoomed out remained at roughly 2 to 4. Units and buildings with more vertices seemed to drop the FPS more.

SwapBuffers was taking roughly 86% of CPU time, indicating a lot of CPU-GPU communication.

My guess would be that the under-construction mesh is being rendered very suboptimally.