Testing latency of post-updating on Google Reader, using Feedburner’s inbuilt PSHB feature, turned off WP plugin.
Update: Even more instantaneous, published at 1439 hrs, appeared on Reader at 1439 hrs. I was PHSB enabled already (as I’ve been on FeedBurner for more than a year now), I just didn’t know it. Thanks to Louis Gray‘s post as well as a 7 month old Adsense Feeds post which I completely missed. Google Reader, FeedBurner, Buzz teams all rock!