This is odd. I have a site with 50,000+ backlinks (PR 4) and posts on the site used to get indexed within 30 mins to 1 hour of posting. Now it takes nearly a day or more to get these posts indexed. My rankings haven't went down, only indexing speed is decreased. My server load hasn't increased, incase you're wondering if Google slowed down indexing due to page loading times. Has anyone experienced this before?
Google probably hasn't seen any relevant new links to your sites. Do you have any blog links? Try to get some.
I think this is related to the indexing thread with tonnes of posts. The bot has either had a breakdown which is more likely or a new algo