Is this normal?
With BNO055, there is a microcontroller between your host and the underlying sensors. This microcontroller mutch fetch the data you requested via register address before it can send it out.
We have an upcoming updated firmware for the BNO055 with optimization to reduce this clock streching effect. But before you ask, unfortunately I cannot comment on timeline for this new firmware release. Keep posted, I will definitely announce it in the forums when available.
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