Hello - Yesterday I installed F13 onto a somewhat older machine of mine, to test out some software that I've been developing
, and while it works quite well in general, there's a couple of situations where gtk+ seems to be incredibly slow.
Most notably, that app lets the user click-and-drag a large map inside a scrolled window; the app updates the scrollbars appropriately. On F13, the click-and-drag starts to lag behind the mouse almost immediately. I had been developing this app on another distro (Gentoo) prior to installing F13 on the machine, and never had this issue then - I've even doublechecked by booting that box onto a Gentoo LiveCD and trying from there, and the speed of click-and-drag is totally fine.
Additionally, and possibly-related: the highlighting which follows the mouse around as you mouseover the map seems to lag behind as well. Otherwise, the system responds quite quickly.
Now, the box is an Athlon XP 2100+ (1.73GHz) with an nVidia 7600GS (AGP) - I've tried using all three of nv, nouveau, and the binary nVidia drivers (both from rpmfusion, and compiled from nvidia.com), and I get the same lag using any of those X drivers.
I've tried changing the desktop theme (in Preferences->Appearance) to some more "basic" themes, but that hasn't affected anything... I've also tried hopping into a very basic WM outside of Gnome (icewm) but the problem persists there. I can't shake the feeling that this is some gtk+ setting getting in the way...
... is there some kind of global "smooth scrolling" gtk+ option I could turn off somewhere, perhaps? Anyone have any ideas? Run into this kind of weird, selective gtk+ slowness before?
---------- Post added at 12:02 PM CDT ---------- Previous post was at 11:44 AM CDT ----------
Oh, and I hadn't thought to try before, but I've just verified that I get the same behavior with the "vesa" driver. The system is otherwise snappy, but that click-and-drag is still horribly slow.
---------- Post added at 12:44 PM CDT ---------- Previous post was at 12:02 PM CDT ----------
Okay, one MORE update - just tried it out on an Ubuntu LiveCD, and the speed is also totally fine on there. Just, you know, as one more datapoint...
---------- Post added at 02:30 PM CDT ---------- Previous post was at 12:44 PM CDT ----------
Okay, so I went ahead and put together a simple test-case which is removed from the actual application, and it still exhibits the same behavior for me. On Fedora 13 it's quite laggy, on other distros on the same hardware it's totally fine. If somebody else wants to give it a go, I'd appreciate it (especially if you're on older hardware like I am)