Thunderbolt 2 Thunderbolt incompatible with one?

I am owner of the Thunderbolt station 1 from the same manufacturer that I use for a long time. It is coupled to a Macbook Pro Retina 15 "first generation.
Improvements between these two models are many:
- Added an HDMI output,
- Replacement of the microphone jack by a headphone / microphone, allowing to have two audio outputs active on the previous model I was using a "jack hub" out simultaneously on external speakers and headphones, over there need hub,
- Passing in front of a three-USB3 taken and taking his / microphone,
- The size was further reduced,
- Belkin abandons the idea of ​​getting the Thunderbolt cable in the box, and it's a good idea,
- Belkin Thunderbolt cable provides 2 whereas previously it was a cable that Apple was using. This cable is very very thin compared to an Apple cable.
Belkin does not change against the stunning quality of the case, in brushed metal and is beautiful.
The packaging is always beautiful, it is on a very qualitative product.

So I switched the station with the previous one. And I did some tests ...

And here is the big-big disappointment.
I checked the performance of two hard disks mounted in one Thunderbolt, the other USB3. The results are clear: this station has lower rates than the previous station!
The USB3 does not lose too much speed I measured roughly 4% loss.
The Thunderbolt is totally against by Strawberry (IT technical term) with a loss of 26%.
These losses are both in writing than in reading.
I tried everything:
- The two Thunderbolt ports on my Mac: same results,
- By unplugging the HDMI display, which inevitably consumes little bandwidth: the same results (surprisingly matter),
- Using an Apple cable and not the Belkin cable: same results.

So yes the Mac I use is a 1 and not a Thunderbolt Thunderbolt 2, probably the problem is there.
In any case it is good to know if his machine is Thunderbolt 1 that station has no interest, at least if it's performance you're looking for!