Gnus is very slow in displaying headers.

[Daniel M. <xt@nm.ru>]

Hello everybody,

I noticed that even when I enter a group with a relatively small 
amount of headers - in my case, 12000 for comp.lang.lisp, it takes 
Gnus a very long time to thread/load them (headers are already in 
the spool - they were downloaded previously by the Gnus) - 3 minutes 
and 100% CPU for the duration of that period.

Forte Agent, for example, has no problem with groups which
contain hundreds of thousands of headers - it takes merely a couple 
of seconds to load them, so it is not a lack of memory/CPU cycles.

Am I doing something wrong, or is it a fundamental issue (elisp is too
slow? something in the core of X/Emacs?) which renders Gnus unusable
for anything more then a very small groups?

After searching the group for a similar questions, I saw an advice
to set nntp-marks-is-evil variable to 't', which I have done, but 
it made no noticable difference.

I use Gnus 5.10.6 on Debian (precompiled package from unstable).

BTW, listing of all active groups (zombie, killed groups - I am not 
sure how I am supposed to call them. In effect, it is the list of all 
groups carried by the server) also takes a lot of time - almost a full 
minute, although there are only ~32000 groups and the file containing
them resides on the HD. I even tried to sort that file, but it didn't 
help :(.

Daniel.