I have a webhotel with five domains at the same server.
One running with Drupal loads fast and no problems, three running WordPress 2.7 and it is very slow - both in admin and at frontend. Takes between 3-7 secs to load. Pages are very small (below 10 kb) and I have 2-3 plugins installed. It does not matter wich theme I use - standard or another - it is still slow.
I tried install DB cache and it seemed to help a little, but now it is all back to status quo again. Have tried clear cache etc. no luck.
The server runs PHP 5.2.2
Apache/1.3.37 (Unix) Sun-ONE-ASP/4.0.2 PHP/5.2.2 mod_throttle/3.1.2 FrontPage/22.214.171.12435 mod_psoft_traffic/0.2 mod_ssl/2.8.28 OpenSSL/0.9.6b
I have tried a lot of what is suggested in this topic and others as well, without any luck so far.
It seems that either there are a lot of webservers not being able to run WP 2.7. smothly or WP 2.7. is just very slow for some unknown reason?