[Uim] [Docs] UIM-XIM slowness

[Martin Swift]

Hi gang,

I tried uim-xim when I ran into my GTK+ problems. It slowed some
things down a lot. Starting terminals took a few seconds while
normally it is instantaneous. Starting a terminal with uim-fep (e.g.
'urxvt -e uim-fep', using rxvt-unicode) is much faster, though a
little slower than without.

Two questions for the docs:

Is the XIM slowness an inherent problem with the bridge?
Should we officially recommend uim-fep for terminals?

Cheers,
Martin

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