Thanks for the feedback! I absolutely agree, the performance hit that these new svg filters created is a bit more than I'd prefer, I'm hoping to find ways to optimize it further. If you feel like it, would you mind testing in Firefox as well? Also, does the current version at dungeonmapdoodler.com/draw work smoothly for you? I'm still trying to nail down exactly why it still runs like crap on some fairly powerful hardware, but then runs great on other slower machines. My own desktop had a 10 year old graphics card up until a month or two ago, and this ran smoothly on it, but a comparably powerful desktop with modern, but integrated graphics runs it at like 3 fps.