unRAID currently ships `bzmodules` and `bzfirmware` as SquashFS, however another read-only filesystem exists called EROFS, which should only be slightly bigger in image size than SquashFS, however it should be much faster, potentially translating to faster boot times. Everyone should gain from this, so I think it might be worth looking into.
References:
https://www.kernel.org/doc/html/v5.8/filesystems/erofs.html
https://www.usenix.org/system/files/atc19-gao.pdf
https://blog.sigma-star.at/post/2022/07/squashfs-erofs/
Command example: `mkfs.erofs -zlzma -C 65536 -Eztailpacking *image* *folder*`
Changes needed (as far as I can tell):
- Enable EROFS support in the kernel (with lzma support, as per example above, if wanted)
- Edit fstab to use `erofs` instead `squashfs` with only `ro` as mount option