Slow scroll

Does anyone have ANY solutions to the iTunes 7 slow scroll problem for Windows XP Home Edition? Any feedback would be appreciated.

I don't believe memory per-se is the cause of this issue. I've quickly profiled Safari 5.1.4 and Firefox 11 using Instruments. The test: load up a website (BBC news, say), and then continually scroll with the trackpad up and down for about 20 seconds while recording data.
For Safari, the call tree suggests that ~90% of the CPU time is being spent in re-drawing the page - that is, it seems to be re-rendering the whole page every time there is a scroll event. This will naturally create slow / irregular frame rates when scrolling.
With Firefox, CPU usage is negligible during scrolling. From the trace, it appears to me that the webpage is rendered once, when it is loaded, into a buffer, and redrawing is then just a case of copying the appropriate part of this buffer to screen (which is fast, especially if done on the gpu). I believe this is much more akin to the methods used on iOS with CoreAnimation (which is why you can get silky smooth scrolling with an ultra-high res iPad with a processor that's far slower than a laptop/desktop CPU).
Moreover, the problem isn't limited to Safari, but crops up in many other Mac desktop apps. I find choppy scrolling in Mail, Reeder, the Mac App Store... from limited testing it all seems to boil down to the same issue. Fundamentally, it would appear that many apps built on AppKit & WebKit will suffer from this issue, until Apple can use some method of caching to  speed up redraws.
I would  suggest filing a bug report with Apple.

Similar Messages

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            Screen      0  "Screen0" 0 0
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            InputDevice    "Keyboard0" "CoreKeyboard"
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            ModulePath   "/usr/lib/xorg/modules"
            FontPath     "/usr/share/fonts/misc"
            FontPath     "/usr/share/fonts/100dpi:unscaled"
            FontPath     "/usr/share/fonts/75dpi:unscaled"
            FontPath     "/usr/share/fonts/TTF"
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            Load  "glx"
            Load  "record"
            Load  "dbe"
            Load  "extmod"
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            Identifier  "Keyboard0"
            Driver      "kbd"
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    Section "InputDevice"
            Identifier  "Mouse0"
            Driver      "mouse"
            Option      "Protocol" "auto"
            Option      "Device" "/dev/input/mice"
            Option      "ZAxisMapping" "4 5 6 7"
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    Section "Monitor"
            Identifier   "Monitor0"
            VendorName   "Monitor Vendor"
            ModelName    "Monitor Model"
            HorizSync    28.0 - 72.0
            VertRefresh  43.0 - 60.0
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            VendorName  "nVidia Corporation"
            BoardName   "G92 [GeForce 9800 GT]"
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            Monitor    "Monitor0"
            SubSection "Display"
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                    Depth     1
            EndSubSection
            SubSection "Display"
                    Viewport   0 0
                    Depth     4
            EndSubSection
            SubSection "Display"
                    Viewport   0 0
                    Depth     8
            EndSubSection
            SubSection "Display"
                    Viewport   0 0
                    Depth     15
            EndSubSection
            SubSection "Display"
                    Viewport   0 0
                    Depth     16
            EndSubSection
            SubSection "Display"
                    Viewport   0 0
                    Depth     24
                    Modes    "1680x1050"
            EndSubSection
    EndSection
    Section "Extensions"
            Option "Composite" "Enable"
            Option "RENDER" "Enable"
    EndSection
    is there something I can change to improve scrolling in firefox? I've tried to turnoff desktop effects and scrolling is the same annd also running firefox from a fresh profile. Hence, i suspect my nvidia 9800GT card to be the culprit. If anyone has a working xorg.conf with nvidia, 64 bit and smooth scrolling on the above mentioned sites please SHARE! Many Thanks!
    Last edited by fettouhi (2012-02-22 17:42:10)

    karol wrote:
    > Tried it now and that worked. Running without a xorg.conf buty now I can't turn on desktop effects in KDE. How do I set that up?
    Sorry, I don't use KDE, but it may be related to how do you start KDE: from xinit or via KDM or sth.
    > How do I determine what driver xorg is using now that I'm running without it xorg.conf?
    It's running the same driver as before.
    > Using the binary nvidia blob driver.
    Did you uninstall it? Did you install the nouveau driver? 'pacman -Qqs xf86-video' will tell you what drivers you have installed.
    No, I don't have the nouveau driver installed. I have to check if I have the nv driver installed but I didn't uninstall the nvidia driver. I'm starting KDE via xinit.

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    Last edited by ianhoolihan (2013-01-30 20:34:57)

    Sorry for the late reply --- I guess I hadn't subscribed to the thread, so didn't realised you'd replied!
    Thanks for the suggestions, but it doesn't seem to have worked. I haven't been using Mutt (because of this annoying scrolling), but seeing your reply prompted me to look again. And guess what I found --- it's related to the mail_check to variable! At the default of 5 seconds, I get slow scrolling. Set it to 60 seconds, and voila, I have fast scrolling! I don't know why it works, but it does, and I am glad = )
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  • Aperture2 - very slow scrolling on macpro

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    Hi, Dave
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    D

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    Rick,
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