The spacing of the page is horrible
The entire page layout (all options) has too much unused space, which means that empty space on the page is not used for the content that users actually want. It's everywhere, but especially a huge waste of space around the sender and subject in the reading pane.
Every day I use this New Yahoo Mail is one day I am closer toward a full switch to mt Gmail account. I HATE this new interface. It is SOOOOOOO SLOOOOOOW. You've added new features I don't want, which requires the entire experience to lag with every click. Going in and out of emails. Slow. Selecting emails to delete. Slow. Switching folders. Slow. Every interaction I have with this New Yahoo Mail is a frustrating experience.