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Re:JS Paint – A web-based MS Paint remake by pluma on Thursday January 18, 2018 @04:58AM (#16175922)
Same here: no noticeable lag in Firefox on Ubuntu.

I'm guessing Safari on macOS?

Re:JS Paint – A web-based MS Paint remake by rangibaby on Thursday January 18, 2018 @05:27AM (#16176017)
no problem with Safari+Macos here