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In the keynote titled **"Ruby 2020"**, delivered by **Evan Phoenix** during **RubyKaigi 2015**, the focus is on the technical advancements necessary for Ruby to achieve significant performance improvements, particularly with the target of Ruby 3 being three times faster than Ruby 2. Phoenix draws from his extensive background with Ruby and related projects while establishing the need for a **Just-in-Time (JIT) compiler** as a crucial component for enhancing Ruby's performance.

### Key Points Discussed:
- **Introduction and Credentials**:  Phoenix introduces himself and expresses gratitude towards the RubyKaigi organizers. He shares his journey in Ruby development, mentioning projects like Rubinius and Puma.
- **Historical Context**: Reflecting on past attempts, Phoenix talks about his earlier work on Ruby, specifically a project called **Sydney**, which introduced native threads but was never merged into CRuby due to its size.
- **Performance Goals**: He discusses Matz's vision for Ruby 3 to be significantly faster and raises questions about the community's approach to achieving this goal.
- **Defining Performance**: Two aspects of performance are outlined: parallel execution and efficiency in code, stressing the complexity involved in achieving true parallelism in Ruby.
- **Micro vs Macro Optimizations**: Phoenix advocates for macro-optimizations rather than relying only on micro-optimizations, emphasizing the limitations of small, incremental changes.
- **Importance of JIT**: He argues that a JIT compiler is pivotal for Ruby's speed improvements, providing examples of how a JIT can radically speed up code execution.
- **Historical Research**: Citing the language **Self** and its innovations in JIT compilation, he shows the principles still relevant today, and discusses how similar strategies can be applied to optimize Ruby.
- **Implementation Approaches**: Phoenix reviews various JIT techniques including tracing JITs and method JITs, detailing the advantages and challenges inherent in each.
- **Integration with CRuby**: He proposes integrating JIT capabilities into CRuby while cautioning against the pitfalls of losing visibility into the operations of core methods, suggesting a 'Canary' approach for profiling.

### Conclusion and Takeaways:
- Phoenix concludes with a call to action for the Ruby community to work collaboratively towards integrating JIT capabilities into CRuby, leveraging existing structures and focusing on practical solutions that align with the language's philosophy.
- He emphasizes the significance of turning ideas into reality for Ruby's future, advocating for systematic changes to achieve the lofty performance goals set for Ruby 3. The keynote serves as both a technical discussion and a motivational push towards innovation within the Ruby community.

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