Topic
Compiling program code to machine code before the program runs, rather than relying on a just-in-time compiler to optimize it during execution.
Vercel Labs' experimental ScriptC compiles TypeScript to native binaries that started in 1.78ms against Node's 61.78ms in one benchmark. The gain holds for short, statically typed programs, while framework code and sustained compute both ran slower than Bun or Node.
Reality
OpenJDK has moved JEP 544, Ahead-of-Time Code Compilation, to Proposed to Target for JDK 28, with review due to close September 28, 2026. Teams that pay for slow Java startup can pencil it into JDK 28 plans, though sizing the gain will take their own measurements.
Reality
A dev.to walkthrough compiles the HTTP/1.1 library h11 into a C extension for roughly twice the speed, and most of the work is reconciling bytearray returns, written to avoid a copy, with annotations that promise bytes.
Reality
Codename One went looking for stack allocation to explain Go's edge and ended up tuning when its collector runs. Three attempts to size the heap allowance from the live set failed because the sweep counters miss live objects.
Reality
JEP 543 proposes finalizing structured concurrency without change, but the last of its seven preview rounds is the one arriving in JDK 27 on September 15. Ahead-of-time code compilation sits at the same Candidate stage.
Reality