Overall is not that bad.
see http://www.eclipse.org/cdt/
Eclipse on my box is pretty vivid, like a normal gtk application. At work I have slower and older p4 1.6Gz, even over there it is still usable.
P.S.
System: Aphlon64 3400+, 1GB 400Mhz ram, nvidia 5900
Fedora Core 2 i386, original kernel and glibc but updateted to 2.8 gnome.
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