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JIT

A compiler that turns code into fast native machine instructions on the fly, right as the program runs.

Just-In-Time compilation splits the difference between interpreting (flexible but slow) and ahead-of-time compiling (fast but rigid): it compiles code to native instructions at runtime, once it knows what's actually needed. This gives near-native speed while still handling code that isn't known until execution, like shaders or bytecode. In microZeus, mzcc JIT-compiles a subset of C to native code, and mzJIT compiles shaders and bytecode at runtime.