Hi, sorry for the late reply; I didn't get a notification for some reason! I'm playing the web version in Firefox, on a Lenovo Thinkpad with 16 GB of RAM. The lag isn't nearly bad enough to be game-breaking or even really annoying, just a little "woop, might not be able to run this forever / add too many bajillions of plants" flag, you know?
"No vomit noises" gang :D