By the way, you can tune boot times further. My print server board boots in 8 seconds to Debian 12 (bootloader + kernel + userspace). 1. Make sure the boot

By the way, you can tune boot times further. My print server board boots in 8 seconds to Debian 12 (bootloader + kernel + userspace). 1. Make sure the bootloader (u-boot) loads the kernel as fast as possible. - Disable automatic Ethernet/USB/other subsystems initialization (you can keep them enabled, just don't activate unless requested in the shell manually by the user) - Tune `distro_bootcmd` command - Make sure that MicroSD/eMMC/SSD works full-speed (with proper clocks and speed protocol) 2. Use fast decompression algorithm for the kernel and initramfs - It's either zstd or gzip 3. Collect boot file access data and sort the files on the filesystem - The benefit in near-linear access & read-ahead I'm pretty sure that the current 20 seconds could be shrunk down to 14 or so.