Performance regression in export to LaTeX?

[Scott Kostyshak]

On Sun, Dec 19, 2021 at 03:45:40PM +0100, Jürgen Spitzmüller wrote:
> Am Sonntag, dem 19.12.2021 um 15:03 +0100 schrieb Jürgen Spitzmüller:
> > So it's the cprotection checks that seem to cost time. Need to check
> > whether this can be optimized.
> 
> After 61b8afd893ec we're back at
> 
> real	0m19,685s
> user	0m15,633s
> sys	0m3,025s
> 
> Which is still a bit slower than stable, but a lot faster that where we
> have been.

Thank you, Jürgen! That is indeed much better.

Here is an example file that might show a different (but related?)
issue:

  https://www.dropbox.com/s/cwaj2ms14fln8oi/example.23.lyx?dl=0

It's a contrived example file. It just pastes a string like "hmmmm" over
and over. I think it is all on the same line. And pdflatex refuses to
compile it because of the extremely long line. I get:

  "! Unable to read an entire line---bufsize=200000."

Thus, a fair response would be "find me a more reasonable use case
before making noise" :)

Nonetheless, the difference in timings are quite large:

On 2.3.0 I'm getting times like the following:

  real	0m6.476s
  user	0m6.396s
  sys	0m0.081s

On master (with your recent fix), I get times like the following:

  real	0m44.676s
  user	0m44.575s
  sys	0m0.092s

I'm still using the following command when testing:

  time mylyx 2.3.x -e pdflatex UserGuide.lyx

The format "pdflatex" is the shortname for "LaTeX (pdflatex)", where
pdf2 is the shortname for "PDF (pdflatex)". i.e., I'm checking just
LyX's LaTeX export without compiling.

Scott
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