Gnus makes Emacs frozen while getting many Emails

[Water Lin]

While my Gnus is getting a lot of Emails from server, it makes Emacs
frozen. Emacs can't edit any docs or even input a command.

Emacs is a single thread program, isn't it? But if I have a lot of
Emails, how can I wait until all Emails are downloaded? If I can do
something while waiting for Emails, it is better!

Any good solution for this?

Thanks

Water Lin

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Email: WaterLin@ymail.com