I am trying to run the notebook https://www.tensorflow.org/text/tutorials/text_classification_rnn from the TensorFlow website. The code has LSTM and Bidirectional layers When the GPU is enabled the time is 56 minutes/epoch. When I am only using the CPU is 264 seconds/epoch. I am using MacBook Pro 14 (10 CPU cores, 16 GPU cores) and TensorFlow-macos 2.8 with TensorFlow-metal 0.5.0.  I face the same problem for TensorFlow-macos 2.9 too. My environment has: tensorflow-macos          2.8.0   tensorflow-metal          0.5.0  tensorflow-text           2.8.1   tensorflow-datasets       4.6.0                    tensorflow-deps           2.8.0                          tensorflow-hub            0.12.0                       tensorflow-metadata       1.8.0                                         When I am using CNNs the GPU is fully enabled and 3-4 times faster than when only using the CPU.  Any idea where is the problem when using LSTMs and Bidirectional?

I am trying to run the notebook Transformer model for language understanding https://www.tensorflow.org/text/tutorials/transformer from the TensorFlow website. Although I get the message "Plugin optimizer for device_type GPU is enabled", the GPU is not used. The code uses no more than 30% of the GPU and is slower than for the case that I use only the CPU. When I am running a code with CNNs, it uses 100% of the GPU. I believe this is related to a previous post of mine https://developer.apple.com/forums/thread/709142 that had LSTMs. The transformer code does not have LSTMs though. I am using MacBook Pro 14 (10 CPU cores, 16 GPU cores) and TensorFlow-macos 2.8 with TensorFlow-metal 0.5.0.  I face the same problem for TensorFlow-macos 2.9.2 too. My environment has: tensorflow-macos          2.8.0   tensorflow-metal          0.5.0  tensorflow-text           2.8.1   tensorflow-datasets       4.6.0                    tensorflow-deps           2.8.0                          tensorflow-hub            0.12.0                       tensorflow-metadata       1.8.0    Any idea why the GPU is not used for more than 30% although it is enabled?