the amazon-adsystem.com seen at bottom of the following screenshot is having perf issues for a few days, or maybe a week now ...
the ad sometimes hang entirely, and the page refresh doesn't flow until the request is completed, i guess ...
it's also possible that they are blacklisting my IP because i have a lot of page requests, i suppose - but it's worth a peek ...
othersise, i can probably tune it out with NoScript, but I don't normally have to limit anything for THP (i let the ads show) ...