xz kernel modules it is

build.sh

@@ -125,7 +125,7 @@ sed -i 's/zstd -q -19 -T0/zstd -q --ultra -22 -T0/g' work/chroot/sbin/mkinitramf
 # fi
 # * Compress remaining kernel modules (like 3MB size reduction)
 find work/chroot/lib/modules/*/kernel/* -type f -name "*.ko" -exec strip --strip-unneeded {} +
-find work/chroot/lib/modules/*/kernel/* -type f -name "*.ko" -exec zstd --rm --ultra -zq22 -T0 {} +
+find work/chroot/lib/modules/*/kernel/* -type f -name "*.ko" -exec xz --x86 -e9T0 {} +
 depmod -b work/chroot "$(basename "$(find work/chroot/lib/modules/* -maxdepth 0)")"
 chroot work/chroot update-initramfs -u