JAX: commitment issues

The article discusses a performance issue in JAX where array lookups on the CPU are unexpectedly slow when the array is not explicitly committed to the CPU. Using jax.default_device context manager does not commit the array to the CPU, leading to unexpected GPU usage and delays. The problem is resolved by using jax.device_put to explicitly commit the array to the CPU. Further testing shows that committing the array significantly reduces lookup times, with subsequent lookups being nearly instantaneous. The issue highlights the importance of explicitly managing device placement in JAX to avoid performance pitfalls.