Just out of curiosity, what hardware/browser are you both running? I'd love to go through it to optimize and see what could be causing those lag issues.
It was working pretty great on my 5 year old macbook pro, though I admit that's not exactly a super weak system haha, until I got a ton of units and things going on and then the sounds started wigging out, but I never experienced much lag. But it obviously is having some issues as you both mention.
Yeah! My laptop is old and I upgraded the parts I could, but the graphics card is not great. Running firefox browser. Here are the specs.
The game would lag when I placed a building. (I was talking to Technopath games (my brother) and he said it was the shaders compiling making it slow down). Hope this helps!