Samsung Galaxy S5, Android 4.4.2-I have used Aquamail for two years on a Galaxy S2/Android 4.1. With this new phone/Android version I am experiencing slow "loading" of messages already viewed. Loading is in quotes because it's not the typical loading behavior (elements appearing in a sequence and the progress bar traveling from left to right). What I am seeing is the progress bar already showing fully loaded and the content appears all at once.
This phenomenon is frequent, but not constant. "Normally" I will experience about a half second delay before a message loads when moving from a previous message. At some random point, the message body of the next message will be blank. Then, whether I move forward or back, the body pane is blank. After 20 to 120 seconds, messages are visible once again.