Forum .LRN Q&A: Re: Server recommend for dotLRN - with 80.000 users-
do you use multiple harddisks for your 128GB Serial ATA?.
If yes, what is your partitioning and where did you install the system and where the postgres data files (the postgres data file should be on a seperate (set of) harddisk(s)).
Anyhow, this does not explain the performance loss. So doing as Dirk suggests will help us help you.