Hey, thanks for the feedback! It might be the first map load that's a bit heavy (I'm working on this now) - later once everything is loaded it should be much faster. Was it just the first couple seconds that were problematic for you or you stayed longer?

PS. there is also a bunch of graphic tiers which suit more older machines. If you click on the top right there is a menu which has a graphics tab. It should switch automatically after a while too.