1696435 - Scrolling with touchpad is very laggy compared to scrolling with a scroll wheel

Status: UNCONFIRMED

(Core :: Panning and Zooming, defect, P3)

Description

[Hon Wen]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0

Steps to reproduce:

I used my laptop"s touchpad to scroll down a website.

Actual results:

It was very laggy and choppy.

Expected results:

Scrolling with my touchpad should be as smooth as scrolling with my scroll wheel.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Panning and Zooming' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Timothy Nikkel (:tnikkel)]

Can you upload your about:support?

Was touchpad scroll always choppy or did it get worse recently?

What website are you scrolling? Even if it's most or many websites please include at least one example site where you see the problem.

Can you upload a profile of the problem using https://profiler.firefox.com/ ? Please use the firefox graphics preset.

Comment 3

[Hon Wen]

Attachment: My about:support

Comment 4

[Hon Wen]

Attachment: My about:support

Comment 5

[Hon Wen]

The touchpad scroll was always choppy and has a low frame rate.I have this issue in google hangouts when I scroll through my chats to see previous messages sent by my friends and the online pdf viewer.

Comment 6

[Hon Wen]

Sorry for the duplicated about:support

Comment 7

[Timothy Nikkel (:tnikkel)]

Thanks.

Is there a reason that you have set pref layers.acceleration.disabled in about:config to true? Can you try with that pref set to false (after restarting firefox)?

Comment 8

[Hon Wen]

I tried to disable it but I still have laggy scrolling

Comment 9

[Timothy Nikkel (:tnikkel)]

Can you post your about support now that you have set layers.acceleration.disabled to false?

Comment 10

[Hon Wen]

Attachment: My about support

Comment 11

[Timothy Nikkel (:tnikkel)]

Thanks. Can you upload a short profile of when you see the laggy scrolling using https://profiler.firefox.com/ ?

Comment 12

[Hon Wen]

OK.I already uploaded. https://share.firefox.dev/3eedeqK

Comment 13

[Timothy Nikkel (:tnikkel)]

(In reply to Hon Wen from comment #12)

OK.I already uploaded. https://share.firefox.dev/3eedeqK

That's a profile taken while you are scrolling with the touchpad and it is laggy? I don't see any scrolling in there.

Comment 14

[Hon Wen]

Ok.This is my profile with the laggy touchpad https://share.firefox.dev/38rctXI

Comment 15

[Hon Wen]

I uploaded the wrong one. This is the one with my touchpad. Webpage lags before it comes to a stop. https://share.firefox.dev/3kZp6hv

Comment 16

[Timothy Nikkel (:tnikkel)]

What page were you scrolling?
Did you perform one continuous scroll or did you perform several smaller scrolls so that the page stops moving in between?

Comment 17

[Hon Wen]

I was scrolling on https://www.google.com/search?hl=en&sxsrf=ALeKk02kIVQ1FoThQhJgcYC1Y6d48k6TVw%3A1615361489693&source=hp&ei=0XVIYPadJ4baz7sPi7Cv-AQ&iflsig=AINFCbYAAAAAYEiD4UqjAKYZDODcE2agAmRFwH_B3EIy&q=google&oq=&gs_lcp=Cgdnd3Mtd2l6EAEYADIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJ1AAWABgo2NoAXAAeACAAQCIAQCSAQCYAQCqAQdnd3Mtd2l6sAEK&sclient=gws-wiz
I performed multiple smaller scrolls so that the page stops moving in between.

Comment 18

[Jeff Fortin]

I've also observed this on a 2x HiDPI (4K) display with 8th-gen Intel® UHD Graphics 620 (KBL GT2) on Wayland, on Fedora 41 / GNOME 47, particularly on the touchpad; strangely enough, scrolling using the laptop's touchscreen is visibly less janky (although still not perfect) than the touchpad.

I am guessing that the issue is much more noticeable on 4K displays than on regular HD displays. Is this the right issue for this, or this would require a separate ticket?

Comment 19

[Botond Ballo [:botond]]

(In reply to Jeff Fortin from comment #18)

I've also observed this on a 2x HiDPI (4K) display with 8th-gen Intel® UHD Graphics 620 (KBL GT2) on Wayland, on Fedora 41 / GNOME 47, particularly on the touchpad; strangely enough, scrolling using the laptop's touchscreen is visibly less janky (although still not perfect) than the touchpad.

I am guessing that the issue is much more noticeable on 4K displays than on regular HD displays. Is this the right issue for this, or this would require a separate ticket?

I think there are enough differences between the touchpad handling code on Windows (the platform used by this bug's reporter) and Linux, that a separate ticket would make sense.