Explore the concept of Hybrid Partial Evaluation in this 50-minute Java conference talk presented by William Cook. Delve into various topics including residual code, automated partial evaluation, and Java-specific partial evaluation mechanisms. Learn about reflection, mutable state, and their implications in partial evaluation. Discover practical applications through examples such as state machine interpreters and web framework interpreters. Examine the Sidit model, regex implementations, and the intriguing partial evaluation paradox. Gain insights into advanced techniques and tricks for optimizing code execution through partial evaluation in Java programming.