Use Workers as When converting a large pdf file it is taking a quite a lot of time

[kotasudhakar]

I think using multiple workers(worker threads in node or webworkers in browser) to render canvases using offscreen canvas (https://web.dev/articles/offscreen-canvas#use_with_popular_libraries) (https://web.dev/articles/offscreen-canvas) actually increases the speed exponentially as rendering/drawing these canvas actually taking a lot time

But i think using the latest beta build of canvas 3.0 is more important than this tbh
#228