Bug#750785: Slowness with context and xetex

[Norbert Preining <preining@logic.at>]

Hi Khaled,

(please keep Debian bug in Cc)

I already have asked Taco and Hans, but it seems that the same problem
occurs also with xelatex, so I thought I ask you for ideas.

We got a report here at Debian that context when run over xetex
is extremely slow, which I can confirm. THe same happens with 
xelatex when loading fontspec.

The test document is a simple
	\starttext
	lots of lorem ipsum in many paragraphs
	\stoptext
or
	\documentclass{article}
	\usepackage{fontspec}
	\begin{document}
	lots of lorem ipsum in many paragraphs
	\end{document}
and if I run this through texexec --xtx or xelatex, 
the page generation slows down, it seems there is a
increasing delay in page generation.

It is interesting that when I drop the original TeX Live (not Debian)
xetex into our /usr/bin, then it is getting fast again.
The difference between TL original and Debian is that we use
shared libraries. For pure text processing the fault should be
in harfbuzz, right? We are having 0.9.28.

Do you have any ideas how to track such a bug? Do you have
any guess where to start?

Norbert

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PREINING, Norbert                               http://www.preining.info
JAIST, Japan                                 TeX Live & Debian Developer
GPG: 0x860CDC13   fp: F7D8 A928 26E3 16A1 9FA0  ACF0 6CAC A448 860C DC13
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