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FYI on a slightly older (but likely "still fast") laptop using a 6700hq on chrome & windows 10 (latest updates, latest drivers) I scribbled for a second on an otherwise blank "medium" map with the free draw tool, and the entire viewport went blank and fans ramped up to 100%.

A cool idea, but I'm still not really sold on apparently heavyweight apps in-browser as they seem to end up with a lot of similar issues.

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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.

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