Lagspike when constructing with resource display enabled

Issue description

There's an understandable lag spike when you press "L" to turn on the resource display.
If you select a building to construct, place a building, cut a building, or generally interact with building ghosts at all, the lag spike is repeated. This can make the game seem extremely unresponsive.

Reproduction steps

Start a game on the new armageddon map (I think it's worse on larger maps)
Turn on resource display with L - note lag spike
Select a building to place - note lag spike
Place the building - note lag spike

Game version and build number

v0.6.0 (b307)

Operating system

Windows

I wanted to add that, while I have the same issue, I have found that it is directly related to the resources shown. If you only show the grid, tree cutting, and mining overlays, it's not happening.

This was fixed in v0.6.1, thanks for the report!