[fChk]

Thanks for the information HR and fChk. I've updated the OP with the results with the LVM root partition "/dev/mapper/centos-root" and I think it should be fine now.  

Sorry!.. but I still can't get my head around those results!

I would have preferred that you also post the commands corresponding to those output. It's always an uncomfortable guessing game when we want to interpret outputs of missing commands.

What's needed is the benchmarking of the virtual disk as a whole (ie /dev/vda); bypassing the file-system entirely:

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# Disk seq.read Speed (Cached)
hdparm -Tt /dev/vda

# Disk seq.read Speed (Direct)
hdparm -Tt --direct /dev/vda

# Disk Seek Rate:
ioping -R /dev/vda

# Disk Sequential Speed:
ioping -RL /dev/vda

As for dd, please run the io section of your script inside your sudoer home directory.

The values in the OP are too high to be credible for a Virmach KVM VPS. If the results of the commands I posted above proved otherwise, then you'll have won the JACKPOT indeed, storage performance-wise !..

What makes me believe that's not the case is this:

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--- /dev/mapper/centos-root: (block device 78 GiB) ioping statistics ---
3.53 k requests completed in 2.76 s, 882.8 MiB read, 1.28 k iops, 320.1 MiB/s
generated 3.53 k requests in 3.00 s, 883 MiB, 1.18 k iops, 294.3 MiB/s
min/avg/max/mdev = 311.7 us / 780.9 us / 16.3 ms / 963.3 us

A rate of 294.3 MiB/s in disk sequential read is much more credible frankly!