Minor quibble but: probably get another 5-15% by upgrading from oldoldstable Debian 11/Bullseye with kernel 5.10 to something modern like Debian 13/Trixie.
Edit: oh these are containers, right; the difference will be far less since the kernel is determined by the host. Still, I find it sad to see old software versions like this used.
Edit: oh these are containers, right; the difference will be far less since the kernel is determined by the host. Still, I find it sad to see old software versions like this used.