Roger from the Google Reader team has been replying to people about why Google Reader may take several hours to show updates from their blogs or web sites.

A Google Reader Help thread shows Roger giving two excuses for a slow Google Reader update. They include:

(1) A site with “few subscribers.”

(2) A site using Google’s FeedBurner.

The “few subscribers” excuse means that Google rather spend their resources crawling larger subscribed feeds more often than feeds with fewer subscribers. That makes a 100% sense. But site’s that use Google’s FeedBurner, a feed management tool, owned by Google, which so many sites use, would slow down Google Reader? Technically it makes sense, but practically, it sounds silly.

Let me quote Roger:

Most sites I subscribe to are visibile in Google Reader within minutes. Some takes a couple hours, but most are within minutes – including this one.

Forum discussion at Google Reader Help.