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Ruby is historically difficult to optimize due to features that improve flexibility and productivity at the cost of performance. Techniques like Ruby's new JIT compiler and deoptimization code help, but still are limited by techniques like monkey-patching and binding inspection. Pre-evaluation is another optimization technique that works based on user-defined contracts and assumptions. Users can opt in to optimizations by limiting their use of Ruby's features and thereby allowing further compiler work. In this talk we'll look at how pre-evaluation works, and what benefits it enables. RubyKaigi 2019 https://rubykaigi.org/2019/presentations/kddeisz.html#apr20
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