[XeTeX] Gentium Book / Book Basic + TeX Ligatures = memory leak

[Akira Kakuto]

Dear Simon,

> % time xelatex -no-pdf test
> ...
> xelatex -no-pdf test  118.87s user 0.91s system 99% cpu 2:00.26 total
>
> 60x slowdown! Memory usage rises to 318M.

Try once more, then you will have the same order of performance
as that for the Gentium.

Best,
Akira