Just tried it on mac os. pixel-scroll-mode works much better here though there is still small noticeable lag. And also I can see that scroll up lagging more than scroll down. Hope it'll help -------------------------------- С уважением, Игнатьев Валентин On Sat, Dec 23, 2017 at 9:30 PM, Valentin Ignatyev wrote: > Hi all. > I just tested this fix. While it doesn't solve the issue, I saw a little > improvement. And now I see the lag pattern. When I slowly start scrolling, > it scrolls for a while and then jumps about 10 rows at the time, then > scrolls a bit more and jumps again > If I swipe my trackpad too fast, emacs instantly eats 100% CPU and hangs > infinitely (it hangs not every time, but rather once in a while. It can > just go to the end of the file). > If I scroll with Ctrl-key as Eli suggested in the first thread mail, it > scrolls better than before the fix, but I still see this lag pattern > (scroll a bit and then jump), but in the smaller scale and it doesn't kill > emacs. > Setting mouse-wheel-progressive-speed to nil seem to make no difference. > > Btw, while I do use macbook, my OS is Arch Linux here :) > I think I'll try to compile latest emacs-26 branch on macos itself and > tell there is defference. Maybe it'll shrink down the scope > > Thanks for your work on this, I really appreciate it > > > > On Sat, Dec 23, 2017 at 7:20 PM, Eli Zaretskii wrote: > >> > Date: Sat, 23 Dec 2017 12:18:56 +0900 (JST) >> > Cc: valentjedi@gmail.com, 29737@debbugs.gnu.org, >> tkk@misasa.okayama-u.ac.jp >> > From: Tak Kunihiro >> > >> > > I'd like to fix this on the release branch, not on master. Is the >> > > patch you sent good to go to the release branch? Does it solve the >> > > display lags mentioned in the bug report? >> > >> > Yes, the patch I sent is good to go to the release branch. >> >> Thanks, pushed to the release branch. >> >> > I'm not 100% sure what 'the display lag' meant. >> >> It meant very slow scrolling, with redisplay falling far behind. >> After applying the patch, I see a definite improvement on my system. >> >> > After the patch, at least I tested with MacBook and do not recognize >> > 'the display lag'. >> >> Right. Valentin, could you please see whether this change makes the >> problem go away, or at least makes it much less of a problem? TIA. >> > >