Layer tool could use some performance optimizations

The layer tool takes like 20 seconds to open on this map: https://coigame.com/Map/413/Evi-U4-unlimed-2026v3-map This map is very large and has lot's of resources. All other parts of the game work fine on this map, just the resource layer thing has some issues.

Thanks for the report, the issue should be fixed in the next patch.
This map was especially affected because of the large number of virtual resources (oil patches and groundwater), loading screen was also affected (40s faster after the fix).