Sugestion: XZ compression in kernel + tcz; squashfs with xz + biger block size

[mocore]

wrt squashfs and compression
iv just found this [linked below]  post lamenting the state of Ubuntu's Snap single-threaded decompression   
... "scripts to recreate these measurements are included" ! .. if any one with similar hw is interested in making comparison?
https://forum.snapcraft.io/t/squashfs-is-a-terrible-storage-format/9466