Publishing Pages and Server Loads

wordpress has been working fine for me ever since i started using it. But as of 6/29/09, whenever i try to save draft/publish a page, my server loads go through the roof. Before i try to publish the page, the server load would be 0.43 but soon as it saves as a draft or publishes, the server loads go as high as 90.xx if unattended to. If i delete it the page that was saved/published, the server loads go right back down to normal. I can publish/save drafts of posts just fine, theres no problems with that, just pages. I have no installed any new plugins in the last 2 weeks. I have a total of 427 pages published so far. Can anyone tell me why this is happening?