[tonto]

HTML5 canvases are probably subject to different rules. I have definitely run into canvas limits also. this stackoverflow from 2014 shows some limits https://stackoverflow.com/a/11585939/2129219 (looks updated in 2018 here https://github.com/jhildenbiddle/canvas-size#test-results)

[jacquesm]

I tried to render a piece of music horizontally on one canvas. That didn't work past a very low limit. In the end I chopped it up into multiple canvases and scroll at most two of them at the time (there is some risk of artifacts at the point where they meet, unfortunately).