My product pages have recently started to take up to 50-100+ seconds to load. I have made no changes to my Magento code and, after speaking extensively with my host, no changes have been made server side (I think).
An example of an affected page:
http://www.blindssupreme.ca/index.php/shop/blinds/faux-wood-blinds/value-faux-wood.html
Pages that work:
http://www.blindssupreme.ca/index.php/shop/blinds/faux-wood-blinds.html
After investigating, I noticed that, upon visiting the affected page, CPU usage jumps to 100% (and basically bogs down the site for anyone else to view). In my system.log, I get the following message:
DEBUG (7): getPriceType::client
The affected Magento version is 1.5.1. We also don't really get that many visitors (no more than ~10 at any one time) so I don't think it's that.