This email client is very slow. Just deleting an email takes a long time, compared to google mail. Improve it.
Deleting emails is frustrating, compared to Google mail. Takes a long time to update and when I want to delete the next one, I end up clicking on the wrong one because of the lag.

-
Shawn S. commented
My android phone yahoo mail works great .... the desktop stinks, because of all the lags.
I thought it might be because I have too many other tabs open .... nope.
It lags often, when I type in the contact names, to the subject of the email to the body of the email. Is it a function of time of day, and use by others?? .... maybe.I'd rather have the speed of the android based mobile yahoo mail on my desktop/laptop. It evens remembers to the last folder I moved the previous email to!! No such performance with the desktop version.
Think of it, I can rant quicker than I can type an email to friends .... somethings wrong with that.