Re: anyone notice speed of 2.17.95 on Windows ?

[Keith OHara]

On Tue, 10 Dec 2013 09:57:20 -0800, Keith OHara <address@hidden> wrote:

> On Tue, 10 Dec 2013 01:59:09 -0800, Phil Holmes <address@hidden> wrote:
>
> > When I benchmarked with and without
> > skylines, I found there was only a noticeable difference with a lot of
> > markup or similar: "normal" music had almost no effect.  As a result, I
> > concluded with skylining was the correct default.

> I'll try your Mikado on my WinXP system,

Chorus Number 5 takes 17.2s with 2.16.2, and takes 31.1s with 2.17.95

This ratio of times is worse than Phil saw when he timed the full Act1 using 
Win64Vista.  So maybe the larger slowdown is localized to WinXP.  Disabling all 
the vertical-skylines-from-stencil-integral settings brings the time down to 
16.2s with version 2.17.95.

The last time we had a doubling of time required on Windows relative to Linux, 
issue 1926, it was repeated calls to find_by_name() that go through Pango to 
the font server.

Here the outlines seem to be properly cached; it looks like each text glyph is 
looked up just one extra time.  The call the to FreeType glyph-outline code 
might cause the extra time, or maybe Guile is less efficient on WinXP, as every 
nook and cranny in every letter is represented in the skylines objects in 
Scheme.