The same Direct2D application works better on a "slow" machine

Question

I wrote a Direct2D application that displays a certain number of graphic elements.

When I run this application, it takes about 4 seconds to display the 700,000 graphic elements of my laptop:

Intel Core i7 CPU Q 720 1.6 GHz
NVIDIA Quadro FX 880M

According to the MSDN Direct2D pages :

Direct2D is a user-mode library that is built using the Direct3D 10.1 API. This means that Direct2D applications benefit from hardware-accelerated rendering on modern mainstream GPUs.

I expected that the same application (without any changes) should work better on another machine with better specifications. So I tried this on a desktop computer:

Intel Xeon(R) CPU 2.27 GHz
NVIDIA GeForce GTX 960

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