I have a site on a shared host (A2 Hosting) that was working just fine until we upgraded to WordPress 2.6. Now the site is running extremely slow, but it seems like the problem only manifests with Firefox, and only when browsing to 2nd level children pages, like so:
http://www.storycorps.net (Loads OK)
Click the "Record Your Story" link
http://www.storycorps.net/record-your-story (Loads OK)
Click on "Locations and Reservations"
and the whole site locks up.
The site becomes unavailable to Firefox. Oddly enough, I can still load it up in Camino and Safari just fine. My host tells me that the server usage is spiking a bit during this time, but nothing that should keep it from loading completely.
Anyone with any ideas? I have tried regenerating my permalinks and optimizing my database to no avail. I have also tried disabling all of my plugins but it did not improve anything. I am able to reproduce this every time and dozens of my users are reporting it.