Quote:
Originally Posted by morpa
I
I have these wishes for an reader with an e-ink-display:
* Should be able to browse pdfs quite fast
* Should handle many formats, pdf and epubs are most important, but cbz, cbr would be nice
* Should have external sd slot
* Great if waterproof
Does a reader like this exist? I guess not 
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No, such a reader does not exist. E-ink readers are optimized for long battery life, so they have relatively slow CPUs; also because the slow update speed of an E-ink screen (compared to LCD) limits the display speed far more than the CPU does, as handling normal ebook formats is a relatively lightweight activity.
Throw something CPU-intensive like a PDF (especially a complex one) at such a device, and everything goes pear-shaped pretty fast, as you found out.
E-ink readers aren't very good at PDFs; they aren't built for them. A good LCD tablet (either of the Android or iOS persuasion) will work much better, and will also handle any other format you'd like to throw at it, but at the cost of lower battery life, an LCD screen and (perhaps?) the waterproofing.