I read a lot of maths and have ended up for the most part using a 10 inch Fire tablet. I then tend to prefer them in their original typeset PDF format that way

I read a lot of maths and have ended up for the most part using a 10 inch Fire tablet. I then tend to prefer them in their original typeset PDF format that way and am able navigate them with the sort of speed you need. It'll depend on the particular technical content but I tend to need to jump back and forth and zoom in and out and it never seems pleasant on e-ink. I've been seriously tempted by splashing out on a BOOX 10.3 (https://shop.boox.com/collections/eink-tablet https://shop.boox.com/collections/eink-tablet) - but don't think I can really justify it to myself and from what I gather the refresh rate is still not going to be anything like a tablet.