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

[kotasudhakar]

Is the feature relevant to the Firefox PDF Viewer?

No

Feature description

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

Other PDF viewers

No response

[Snuffleupagus]

Using multiple web-workers isn't free, since there's overhead when starting them and also overhead when sending data to/from workers; hence there might not be much of a performance improvement overall. Furthermore, using multiple web-workers would significantly increase the complexity of the code and might also introduce various edge-case problems.

Given the overall lack of context, or any actual data that suggests a clear improvement, let's close this as WONTFIX; please also see https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#idea

[kotasudhakar]

Can I actually make a demo and demonstrate the performance improvements, if that's okay @Snuffleupagus ?

[Snuffleupagus]

Can I actually make a demo and demonstrate the performance improvements,

Please note that #18647 (comment) mentions a number of potential issues, hence a standalone demo probably isn't very helpful. (And once again: please refrain from needlessly tagging users, since that creates notification spam.)

Also, since this is just a word for word copy of k-yle/pdf-to-img#238 it seems that maybe your issue is actually with Node.js since it doesn't support web-workers. (We won't add support for the Node.js "Worker threads" concept in the PDF.js library.)