The influence of the adapter on the electrical specification is very low due to the short length.

The two connectors (A-B) are very short connected, twisting (as it is e.g. mandatory in the USB 2.0 standard for cables) is not possible.
The only thing which can happen is that two long USB cables are connected via our adapter and thus the maximum allowable total length is exceeded.

Abridgements of relevant documents:

• USB 2.0 is an evolution of the USB 1.1 specification, providing a higher performance interface. Today’s USB 1.1 connectors and full-speed cables will support the higher speeds of USB 2.0 without any changes. Characterization that has already been done on these cables confirms this compatibility.
• The maximum allowable cable length is determined by signal pair attenuation and propagation delay. Refer to Universal Serial Bus Specification Sections 7.1.14 and 7.1.17 for details.
• The GND lead provides a common ground reference between the upstream and downstream ports.
• The maximum cable length is limited by the voltage drop across the GND lead. Refer to Universal Serial Bus Specification Section 7.2.2 for details.