The VPS with SSD cached is much faster than normal HDD. Servermania had a email to me last week. It said there is a upgrade of the hardware on the host of my VPS. From normal HDD storage to SSD Cached HDD.
Here is a benchmark report for the new one.
UnixBench score: 2456.6
I/O rate: 139.0 MB/second
Bandwidth rate: 37.5 MB/second
It is 4 core CPU.
The IO read with cache is faster than before.
It is double the figure of the speed.