On Thu, 2004-10-14 at 09:41 -0400, Dave Ahlswede wrote: > On Thu, 2004-10-14 at 15:21 +0200, Alexander Larsson wrote: > > Pango is used very little in vte. I think at this point the major > > slowdown in gnome-terminal is rendering the text. If you pick a bitmap > > font its a lot faster. If someone wants to optimize this they need to > > work on the Xserver level to make Xrender faster. Latest Xorg version > > already has some optimizations in this area. > > I don't think that's entirely it.. rxvt-unicode has similar capabilities > to Gnome-terminal (Xft fonts, unicode support, automatic > font-switching), and for some reason or another renders text much > faster. > > This can be observed by catting a large text file (One that would take > several seconds to completely print), and observing a CPU monitor-- > Gnome-terminal causes the CPU usage to go up appreciably higher than > rxvt-unicode's. (On my system, gnome-terminal measures about 40% usage, > while rxvt measures in at about 13%). This is with the same Xft font, > fully antialiased. > > So I think there's definitely a possibility for some sort of speedup in > the rendering somewhere. One thing you can think about is - what is the correct behavior when catting a large text file to a terminal - shouldn't it just show the last page instantly? If someone really wanted to work on vte, I think the first question you'd have to answer is "what is the ideal behavior you are shooting for" - one possible answer is that it should read data as fast as possible off standard in and show one page per vertical blanking refresh at the current position. Regards, Owen
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