Scrolling is slow in Full Screen mode
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#29 Scrolling is slow in Full Screen mode
Scrolling is slow in Full Screen mode (i.e. lines
moving up in an xterm), whereas paging is
comfortably fast (i.e. complete redraw). Dragging
windows is also slow. Seems to be tied to
situations where the image on screen is
translated horizontally and/or vertically.
Both scrolling and dragging windows seems fast
in rootless mode.
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Moving from Bugs to Feature Requests.
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The same thing happened on my side (both on XDarwin 1.0.6
and XFree86 4.2), so I did x11perf.
Rootless Full screen
copywinwin100 0.5782 7.4163
copypixwin100 0.9450 0.9231
putimage100 7.0106 3.2425
scroll100 0.7440 12.7221
rect100 0.6156 0.8386
ftext 0.0042 0.0017
Copying within the same window is extremely slower in the
full screen mode.
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The main difference between rootless and full screen modes
is that rootless drawing is buffered. For operations like
scrolling, which involve copying one section of a window to
another, this can make a big difference. There are plans to
improve the performance of XDarwin in general for the next
full release of XFree86 (4.3.0). Rootless mode will be the
first thing we concentrate on, but I would like to at least
get full screen mode to use a shadow framebuffer.
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The top of the tree now uses shadowfb for full screen mode. This greatly accelerates scrolling and drags. Drags are much smoother and scrolling is about 10 times faster.