Multiplexing works well and shows some substantial perf gains, but has some rough edges which may make it unsuitable for the general public. Here are some tasks for making it better:

• Reimplement multiplexing via NpgsqlDataSource.CreateCommand #4496
• Implement resultset buffering #3990 (maybe, not sure)
• Check the thread safety of our type handlers #3961
• Design behavior around timeouts and multiplexing #3110 (maybe)
• Do same logging/tracing in multiplexing as in non-multiplexing #4159
• Properly shut down the multiplexing write loop when the data source is disposed #4686
• Multiplexing bugs #4683
• Proper documentation