[Texmacs-dev] Speedup in startup time

[Norbert Nemec]

Hi there,

I just tried to do some profiling of TeXmacs and managed to produce a small but 
significant speedup in the startup time: from 2.0 sec to 1.8 sec (averaged over 
several runs of "time texmacs -q").

Turns out that quite some time was spent in frequent calls to the routine 
implemented as

-------
inline bool is_none (url u) { return u->t == tuple ("none"); }
-------

replacing this by a comparison with a global variable initialized just once. 
Attached is a tiny patch that implements this change.

Far more important than this change itself, however, is the general question 
that it poses: how many more objects are there in the code that are initialized 
from a constant string over and over again? How much efficiency could we gain 
from a global symbol table that is initialized just once?

Greetings,
Norbert
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