SMF - upgraded to 2.0.15, Tapatalk - upgraded to 4.5.2
Didn't there used to be an option to limit the size of the initial download of messages so that large messages or huge attachments don't load completely unless you request it? Or am I getting this confused with another email app? It's a feature that does save on your data usage.
You can set the size of loading messages in AquaMail settings / Network / WiFi settings + Mobile data settings. I'm sure that is what you are searching for.