Upgraded LXC to Bullseye, Console extremely slow

Hallo,
I'm running the latest ProxMox VE7 version and now wanted to start upgrading some uncomplicated LXCs (Debian10).
I now upgraded three containers and all of them basically work, but some shell commands are extremly slow.
For example, logging in, after entering the credentials, it takes up to a minute for the login to finished.
Same with apt commands, after pressing 'Y' for installing something, it doens't show any progress, but after a while it's done.
So it looks like the LXC is doing...

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