> But for PDFs that have a lot of vector graphics and are over 50-100mb

I also have opened Lenovo Thinkpad manuals, hahaha. For those who haven't, it's quite amazing, really: the SVG images are exports of the full CAD model of the laptop without any culling of elements that aren't visible. And I know this because I used to see each indiduad screw be rendered slowly afer the other whenever pdf.js tried to render one of those bad boys.