From cPanel blog:
Previous postings have discussed at greater length the benefits and enhancements introduced in 11.24. Now, server administrators that prefer to use our STABLE build can experience all these important new optimizations and performance increases.
If your server is set to automatically update no intervention on your part is needed and your server will automatically update at its normal time. If you are set to manual updates, updating through WHM or via the shell will realize the performance increases present in 11.24.
More information regarding 11.24 can be found here: