I've not currently got any VM's on the server worth testing but I did do a parity check
6.5.3-rc1 - 2018-05-20, 19:51:00
10 hr, 35 min, 16 sec
105.0 MB/s
OK
0
6.5.2-rc1 - 2018-05-04, 10:13:55
12 hr, 13 min, 54 sec
90.9 MB/s
OK
0
100MB/s to 105MB/s so this is in the normal range.
M/B: ASRock - Z77 Pro4-M
CPU: Intel® Core™ i7-3770 CPU @ 3.40GHz
HVM: Enabled
IOMMU: Enabled
Cache: 1024 kB, 128 kB, 8192 kB
Memory: 32 GB (max. installable capacity 32 GB)
Network: eth0: 1000 Mb/s, full duplex, mtu 1500