Ross Vandegrift ross at
Thu Apr 9 10:21:31 PDT 2009

On Thu, Apr 09, 2009 at 12:46:57PM -0400, Jim Gettys wrote:
> That is downright strange.  Are you comparing the same application? or
> different applications?
> GTK may be doing something really stupid internally, that has nothing to
> do with fonts, but is related to the latency.  I've suspected as much at
> times....
> Please be so kind as to give us a concrete test case....

Mozilla, pidgin, gnome-terminal, emacs with GTK.  All of them I
occasionally use across an ssh tunnel and it's typically quite bad.
It's good across a LAN with latency in the few ms range, but gets bad
very quickly as latency increases - keypresses and redraws are
noticably sluggish.  xterm and emacs with Xt/Motif are all much
better, even across links with larger latency.

I seem to recall reading, years ago, a post or paper discussing
network performance issues in GTK and Qt, and pinning the issue on
too many round-trips.  Xt/Motif were nicer in this sense, and hence
their higher performance.

But none of that has much of anything to do with fonts.

Ross Vandegrift
ross at

"If the fight gets hot, the songs get hotter.  If the going gets tough,
the songs get tougher."
	--Woody Guthrie

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