"The alleged improvements in version 4.0 are legion, with
increased performance being at the forefront. XFree86 has
always been fast on my system, so it feels about the same to me.
But you may notice a difference, depending on the display hardware
you're using. XFree86 also includes new 3D acceleration features,
although they are largely untapped right now because they are only
supported on a handful of display cards."
"XFree86 is much more modular this time around. The more
monolithic design of previous versions made it necessary to expose
the source code for all display card drivers. The new modular
design makes it possible for display card vendors to produce
binary-only drivers. This is both good and bad news. On the up
side, it probably means we'll see more display card vendors
supporting Linux, since they no longer have to open their source
code in order to build drivers. On the down side, the open source
community won't be able to fix bugs when they occur; we'll have to
wait for the vendors to fix them...."
"Unfortunately, though it's easy enough to install XFree86 4.0,
getting it configured for your display card and monitor isn't as
simple a task. The process isn't well documented at all, and
because it breaks all the easy X11 configuration programs that have
become available over the past few years, you'll have to go back to
the unfriendly XF86Config program, or even edit the text
configuration files manually."
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