I'd be also interested in your setup - on a W10 hosted VBox (latest) on a fast M.2 disk I get approximately 5 times slower values, on -current amd64, having disks attached to SATA, SAS and NVMe controllers (almost the same, the SAS one is a little slower than the rest, but nowhere near your figures. :
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➜ xci df -k
Filesystem 1K-blocks Used Avail %Cap Mounted on
/dev/wd0a 11181622 9494768 1127774 89% / <-------- SATA
kernfs 1 1 0 100% /kern
ptyfs 1 1 0 100% /dev/pts
procfs 4 4 0 100% /proc
tmpfs 786316 0 786316 0% /var/shm
/dev/sd0e 16515150 10366632 5322762 66% /usr/pkgsrc
/dev/ld0a 16515182 11712358 3977066 74% /usr/pkg
/dev/sd1a 33030380 29489804 1889058 93% /home/sysbuild
➜ xci dd if=/dev/zero of=out bs=1m count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.497 secs (91204314 bytes/sec)
➜ xci cd /usr/pkg
➜ pkg dd if=/dev/zero of=out bs=1m count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.303 secs (92769707 bytes/sec)
➜ pkg cd /usr/pkgsrc
➜ pkgsrc dd if=/dev/zero of=out bs=1m count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.854 secs (88457567 bytes/sec)
➜ pkgsrc cd /home/sysbuild
➜ sysbuild dd if=/dev/zero of=out bs=1m count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.776 secs (89043478 bytes/sec)
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Chavdar Ivanov