That usually means that either the third-party website is slow to respond or you have some custom blocking in place (via HOSTS file, firewall, etc.) that is causing it to hang. Hopefully CNET can take measures to reduce the impact of those third-party scripts/calls, like they did with their Twitter SPOF, but I haven't noticed any issues specific to crowdscience.com as of late, so I'd suggest checking your end as well.
This happens on different forums at different time
When using mark all as read the status reads "transferring data from ping crowdscience.com "
I have to press mark all as read to continue browsing the forums