The game is pretty fast overrall, panning the map around or zooming is generally fast and smooth. But all interaction with the UI is super sluggish and laggy, especially with special buildings (research center, hacker, etc). Tooltips take ages to appear and some UI elements stack upon each other when clicking around too much. The game is noticeably smoother after victory using the "map" mode to look around the map.

Here are my specs:

Windows 7 64bits
Intel Core i5 M450 2.40GHz
4GB RAM
Mobility Radeon HD5850 

I realize this laptop is a bit on the old side now, but the UI sluggishness seems odd and feels more like some bug rather than weak hardware.

Except for this rather annoying problem, the game feels pretty polished and is great fun. Congratulations for the launch