Mail app is super slow

Please help! I've done a bunch of stuff already, with no results. Something regarding a file called envelope something-or-other, gone through the "rebuild mailbox" route, and none of it has helped. I click on any mail in my IMAP inbox and it takes at least 20 seconds for the message to appear. Even closing my mail window altogether takes a long time. Typing a message sometimes drags. It's all very annoying. I am somewhat savvy computer-wise, but have not found a solution. I welcome any ideas. Thanks!

You need to delete the Mail "sandbox" folder. Back up all data first.
Triple-click the line below to select it, then copy it to the Clipboard (command-C):
~/Library/Containers/com.apple.mail
Quit Mail.
In the Finder, select Go ▹ Go to Folder from the menu bar. Paste (command-V) into the box that opens, then press return. A Finder window should open with a folder named "com.apple.mail" selected. If it does, move the selected  folder — not just its contents — to the Trash.
Relaunch Mail and test.
Caution: If you change any of the contents of the sandbox, but leave the folder itself in place, Mail may crash or not launch at all. Deleting the whole sandbox will cause it to be rebuilt automatically.

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