Earlier quoted context omitted.
(I wrote SumatraPDF). I agree that Adobe has more features than SumatraPDF. Not necessarily the PDF spec itself - SumatraPDF displays pretty much any PDF you throw at it, just way more options and stuff. And it's not exactly slow. I'm sure the core rendering of PDF pages is same or faster. It's just slow to start. Like very, very, sluggish slow. And it's very visible to users. I don't think it's the features that cau…
I actually have to pay for Adobe because I need the features (signing, annotation, redaction, OCR etc). Does SumatraPDF cover those at all? As for startup speed, it's not really an issue as Adobe just lurks there all day in the taskbar for me at least ready to roll.
More / better annotation editing, signing, redaction is something I want to do.
OCR - I don't have a good handle on how important that is.