Perhaps a sample of OmniWeb would be helpful. Try this:
Open up Activity Monitor which is located in your Applications > Utilities folder.
Start OmniWeb, and visit one of these pages.
Back in Activity Monitor, locate OmniWeb in the list of applications, select it.
In the view menu select "Sample Process" or click on the Sample toolbar item.
Copy the contents of the sample into a text document and attach it here or mail it to
omniweb5@omnigroup.com. Myself or Dave will see it there, thanks!
Also, checking the error log in OmniWeb after attempting to load a page might be helpful as well. (It's available in the Window menu.)