mkinitfs 3.6.0_rc2 takes considerably longer during boot

mkinitfs.conf

features="ata base ide scsi usb virtio xfs nvme"

fdisk -l

Disk /dev/nvme0n1: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 980 500GB                   
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 16384 bytes / 131072 bytes
Disklabel type: gpt
Disk identifier: 547D8CD3-6EE7-431E-8373-73DF9406C3D8

Device           Start       End   Sectors   Size Type
/dev/nvme0n1p1    2048   1026047   1024000   500M EFI System
/dev/nvme0n1p2 1026048 976773134 975747087 465.3G Linux root (x86-64)

/etc/fstab

UUID=556586a4-ecbb-4321-b0ac-8cd6d446cb8f	/	xfs	rw,lazytime,attr2,inode64,logbufs=8,logbsize=32k,sunit=32,swidth=256,noquota,nodiscard 0 1
UUID=61F6-3B11	/boot/efi	vfat	rw,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=utf8,shortname=mixed,errors=remount-ro 0 2
tmpfs	/tmp	tmpfs	defaults,size=40%,mode=1777 0 0
/root/swap	none	swap	defaults	0	0

dmesg-3.5.0-r0.log
dmesg-3.6.0_rc2-r0.log

rootfs is xfs, sys/disk install

dmesg logs show 6.7s for mounting root in 3.6 and 0.6s in 3.5