The thing which needs most proccessing time is parsing (we're using a real parser not just a bunch of regexps) but also rendering (creating XHTML from the parsed data) needs some time. DokuWiki uses caching to speed up repetitive pageviews.

However a 266Mhz processor is probably too slow for anything. You may be able to run one of the simpler Wikis on this system but I guess any of the bigger ones will have problems on your machine.

@zaher: the fetch.php is needed to make sure ACL are honored for media files. The script resets the timelimit if possible to avoid the problem you describe. If this doesn't work for you, you should host big files at a different location and just link to them.

I just tested the speed difference between your two wikis:

$> time for x in `seq 5`; do wget 'http://www.parmaja.com/forums/doku.php?id=innosetup' -O foo; done
real    0m3.086s
user    0m0.004s
sys    0m0.028s

$> time for x in `seq 5`; do wget 'http://www.parmaja.com/wiki/innosetup' -O foo; done
real    0m3.537s
user    0m0.020s
sys    0m0.008s

So for 5 requests on the same page the difference is a half second - not critical I would say. However I can give you one recommendation for speed improvement: install the mb_string extension for PHP - it gives a huge boost in handling UTF-8 data.