I used to use Keras on top of Theano, and did performance testing of Keras on TensorFlow in parallel every TensorFlow release.<p>The last release (0.8) of TensorFlow is much faster to my use case (model compilation twice as fast, execution about 10% faster) and made the switch to TensorFlow across the whole cluster about a week ago. Has been performing well and the transition was pretty seamless thanks to Keras.