On Tue, Jun 23, 2026 at 03:52:12PM +0200, Pavel Sanda wrote: > Hi all, > > it's my long-term pain to wait for lyx loading the graphics when conversion > chain is needed for the view. With longer reports with tons of images one has > to wait while most of the cores are idling. Years back I created some patch > to parallelize the preview chain, but it kept crashing for strange reason. > > I looked into the issue again now with claude and have decent version which > does not crash anymore.
Great! I also have a patch that loads images in parallel that I have been locally testing for a while. But I don't have a good understanding and I just hacked things together. Yours seems well thought out. > 1. The attached code triggers in parallel min(4, #of threads on your machine) > conversion chains and thus process the conversions fater. I kept the cap > on 4 > so we don't overload the machine because of RAM. > Might slow initial load times on some machines. > I prefer it this way but I could see someone might not like it, objections? I personally would like the option to be able to increase the threads. But this can be figured out later. > 2. I am introducing lfun which would trigger autoload of all previews. I found > myself regularly to scroll through the whole document, just that the load > process start and I dont have to wait later when working with the rest of > document. That's somewhat ridiculous. I do not propose to add this to UI > and keep it for power user who can bind it by shortcut. > > Completely different approach would be just autoload everything on start > by default, but I don't like that option - the preview can take on longer > documents quite a while and slows down all editation. > > It's in the second patch, and it does not interfere with the rest of the > codebase, so should be less controversial. Currently childern are included, > but I am thinking of striping that part. > Anyway are there some objections to include this lfun? Not from me. I also find myself scrolling down just to trigger loading. Not sure if related, but I also find it annoying that the scrollbar length is not accurate. I don't like scrolling down and it gets constantly readjusted as the document is loaded on-the-fly. I would prefer an option to just have everything load at the beginning. Okular has a nice "performance" tab of preferences. I attach a screenshot. Scott
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