You are tasked with optimizing the performance of a Snowpark Python application that performs complex data transformations on a large dataset of IoT sensor readings. The application uses a Snowpark-optimized warehouse. You notice that the application is consistently slow, with CPU utilization on the warehouse fluctuating significantly. Which of the following actions would be MOST effective in addressing this performance issue? Assume the dataset is partitioned on the 'sensor_id' column within Snowflake.
Correct Answer: C,D,E
Repartitioning allows for improved parallelism and reduces data skew, especially when the initial data distribution is uneven. Avoiding Python UDFs improves performance because they execute outside of Snowflake's optimized engine. Pushing down transformations and leveraging stored procedures minimizes data transfer between Snowpark and Snowflake, and leverages Snowflake's processing capabilities. Increasing warehouse size or enabling auto-scaling might help, but addressing data skew and UDF overhead will likely provide more significant performance gains.