![]() When I channge it to "Single Page Scrolling" I never saw it go about 34% and it doesn't appear to be slow. ![]() I found that when I have "Continous Scrolling" turned on it is slow most of the time and uses up to 88% of CPU when scrolling. Hey, I found something out that is interesting that may help you. I don't like that because Adobe may want to claim all PDFs by default, forcing you to swap it back if you want to go back to Preview, but it might help. I suppose one final test (though I don't really like it) would be to obain Adobe's Free Reader for the Mac and see if that has the same problem or not. It's possible the file contains some graphics structure that might be slowing things up, though I'd think that would only show if you passed by a page with that sort of graphic. If you create a pure text PDF of about the same number of pages (if you have a large text only document you could import it into TextEdit, Pages, Word, etc., copy/paste it into itself enough to get 1000 pages, then print to disk) you might look at that as well. If it does, you could try deleting the Preview plist file in your user Library folder (Preview should recreate it if it's missing). ![]() That way you could see if the problem seems linked to the account. It might relate to the preference file (weird things sometimes hit there), but I suspect you could eliminate that if you temporarily created another user account and opened up a problem PDF there. I'd suggesting loading Activity Monitor and sorting by CPU usage, along with displaying disk activity at the bottom and see which one (if either) appears to be where Preview is concentrating while it's hung up. If you send it to the end of the file does it go there instantly or does it hang up? Hopefully a fix for laggy PDFs on 4K comes soon as I've been using Edge Legacy for PDFs and Edge Chromium for browsing (both open at the same time) which only generate extra battery drain.Hopefully someone else will also have ideas, but I'm wondering if Preview is waiting on the disk, is chewing up the CPU or just sitting there but not showing anything. ![]() ![]() Another possible solution would be to set specific resolution for PDFs but I don't know how easy it is to implement this. This would be favorable for those that don't lag in 2K resolution, 4K users to experience no lag, and also help Edge's devs to make a quick solution for this so they work on other things and not take time on this. A quick solution for this would be to have an edge://flag or setting to turn off rendering the entire PDF at once and instead load it per page (or pages) while viewing said page. I suspect this is because unlike Edge Legacy, Edge Chromium renders the entire PDF from the start (you can try it out yourself and zoom out max + fast scroll below and you'll see everything already loaded) while Edge Legacy only rendered the page you're in and load the rest when you scroll to that page (a bit slow when browsing pages fast, but thanks to this feature, PDFs in 4K work wonders with 0 lag everywhere). First post here, don't know if it's already been mentioned here but has 4K support for PDFs been discussed here before? Context: PDFs rendered in 4K resolution lag immensely (regardless of size) when opened with Edge Chromium. ![]()
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