brotherhood_of_LAN - 9:55 pm on Aug 3, 2011 (gmt 0)
The slowdown on a shared or VPS is at the database
Indeed, if anyone can edit their my.ini and WP still uses MyISAM tables, then you'll want to increase the key_buffer value if possible. This will store most frequently requested index values into memory.
A bit OT but here's a post about how partitioning can help WP speed, by putting older less frequently accessed data into separate partitions from the regularly accessed data [pento.net...]