Has anyone else noticed a drop in rendering speed on iOS 10 recently? My email is rendering super slowly to the point where I'm getting complaints from a fairly significant number of subscribers. I'm not sure exactly when this started happening, but it's fairly recently, maybe up to a month ago?

Here's an example of the email loading and taking more than 20 seconds to appear.

https://youtu.be/8DzWjd8ofUA

I'm not certain whether this is a general slow down or something related to the specific markup/CSS I'm using but it's a pretty terrible situation for subscribers right now. Just wondering if anyone else has seen similar problems with their mails recently before I start to investigate the code.