To quickly change emails to “read” status in gmail, I tap on emails (opening them) and when in the email I either swipe right or tap the back arrow to return to inbox. I like to do many of these in quick succession to get rid of the amount of unread emails I have.
Once an email is opened, it freezes on the opened page and I have to exit the Gmail app to unfreeze it. About every second or third email in a row is freezing