I see now, thanks.
This appears to be a kernel regression relating to 'ast' performance:
04:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics
Family (rev 21)
Subsystem: ASUSTeK Computer Inc. ASPEED Graphics Family
Kernel driver in use: ast
Kernel modules: ast
** Summary changed:
- server console output extremely slow after upgrade to 18.04
+ ASPEED server console output extremely slow after upgrade to 18.04
** Package changed: ubuntu => linux (Ubuntu)
** Tags added: regression-release
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1808183
Title:
ASPEED server console output extremely slow after upgrade to 18.04
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