Same issues as others' comments. I hate your new format. Slow file upload, whenever I drag photos in my email it doesn't upload as file.
HATE YAHOO MAIL. BRING BACK THE OLD ONE

This help page explains how to switch back:
https://help.yahoo.com/kb/switch-back-previous-version-yahoo-mail-sln15936.html?redirect=true
Thank you!
Mail Support
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Michael Eayrs commented
I don't mind seeing advertisements in most products because I recognize that there needs to be a revenue stream to pay for the service. But, in Yahoo Mail, there's a huge memory leak. I resorted to using AdBlock for a period of time, but your system detected AdBlock and I had to stop using it. While I used AdBlock, the memory usage fell to normal limits, similar to what I get when I use Gmail or Outlook.com. When I disabled AdBlock, the memory usage for that particular tab would increase to over 4GB. I'd have to make sure I quickly finished reviewing emails in Yahoo so I could close it out before my computer slowed down too much. Once I close the tab, the memory usage falls back to normal levels (about 1 GB. I would love to continue using Yahoo Mail but I'll need to switch to using my Outlook.com email because of the Memory Leak issue. As I mentioned, I don't mind advertisements, and sometimes find them to be useful, but this memory leak problem is a deal breaker and I won't resort to using Yahoo's paid version. I might as well use Office 365 for a similar price and get much more functionality.
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Utes! commented
Incoming emails are super slow loading to my iPhone. Also It would be nice if I got notified if a new email has come in on my phone. I mainly us my iPhone to read emails and this new version does not work nearly as well as the one before this.
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Marty commented
When I put my curser over my e-mail list it disappears & it takes forever to look at an e-mail. Also the dropdown box that has the list of places to move an e-mail once I finally get to see it used to stay on the last place I moved an e-mail to. Now I have to start I the top EVERY TIME! I hate it as I pick out my e-mail to look at in abc order. I don't have a lot of time to look at e-mails in the mornings and all of this slows it down so I NEVER get through my new e-mails, let alone the ones that I missed the day before. I HATE THE NEW YAHOO! ! ! FIX IT ! ! ! You have made it worse then I can ever remember it being since I started using in. IT IS HORRIBLE! ! !
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Manuel Cordero commented
The new feature is slowing down my acces to mails, sometimes is hard to page down in the imbox.
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Francis commented
I cant acces all my archive folder. I have access to all the rest
your system is so slow with all the -
Maurizio Stronati commented
Unfortunately, the site has become completely unresponsive. It is an extremely slow and painful ordeal to complete any operation...what's up?
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Yvonne Hunt Hunt commented
Take me back to the former version. This is extremely slow. Can't find how to access my folders. This is definitely NOT an improvement!!!!
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Margaret Booker commented
Scroll is locked up in my unread incoming mail folder this morning. Scrolling unread messages is slow and jumpy generally, but today it is locking up.
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merri ferrell commented
NOTHING ABOUT NEW EMAIL WORKS. SLOW, CAN'T OPEN, WON'T PRINT, BUSY WITH ALL THE ADS ON THE SIDE, DELAY IN CHARACTERS DISPLAYING DURING WRITING.
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Peter Longden commented
Sorry but this is so bad. Might even go to another email provider as the changes you've made are so aweful!
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Peter Longden commented
Replying in a conversation - rubbish! Can't see how to do it. The slowness of the turnaround too is really not good - even feedback is bad!
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Mary Macionski commented
get rid of it. TOO SlOw, it bounces and you cannot control the cursor. it is awful. GO Back to the old one. Get rid of you loser webmasters. they have mastered nothing. when you have a good format, KEEP IT. only YOU think that changing it is will make it better. NOT
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Fred Ruder commented
Give me back the old email format, it was great, fast, and did what i needed with mail and folders; the new system is extremely slow and candidly sucks
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Mike Dickens commented
New mail is rubbish - too slow - difficult to amend - and lots of junk mail that never came before.
YOU have gone backwards on performance ---GET IT FIXED SOON !!!!! -
[Deleted User] commented
Moving to gmail, you don't take any notice of the complaints. I cannot work with a slow uncooperative e-mail.