I wrote a similar program using PDF.js that renders near real-time (https://parepdf.com https://parepdf.com). You should be able to queue it up without too much

I wrote a similar program using PDF.js that renders near real-time (https://parepdf.com https://parepdf.com). You should be able to queue it up without too much trouble. If you’re doing pixel level manipulation, you want to make sure you’re finishing within the browsers frame budget.