The best JIT compilers, according to hackers
6 JIT compilers were recommended on Hacker News between November 2025 and November 2026. We rank them by how many separate people recommend each one, and 2 earn the Hacker Approved badge.
Top picks
The two most recommended JIT compilers with the badge. Each figure is 2 people. RecommendsCriticizes One comment
Easy speedups with a decorator
Speeds up numerical Python code by compiling decorated functions, especially numpy and parallel loops. Caveat: only partly compatible with CPython and best on code of a particular shape.
Large performance gains for free
Built into Ruby, used in production, and gives performance gains for free. Critics note its profile-guided design pays a cost when hot paths change type.
All 6 JIT compilers, ranked
Select a column heading to sort. Approval share is recommenders out of everyone who gave an opinion; the tick on each bar marks the 2 to 1 line the badge needs. Months counts the months, out of 13, in which someone recommended it.
| Rank | |||||||
|---|---|---|---|---|---|---|---|
| 1 | Numba | 30 | 9 | 77% | 9 | — | Approved |
| 2 | CPython experimental JIT | 13 | 16 | 45% | 3 | — | — |
| 3 | YJIT | 10 | 2 | 83% | 6 | — | Approved |
| 4 | HotSpot JVM | 8 | 0 | 100% | 4 | — | — |
| 5 | ZJIT | 7 | 2 | 78% | 5 | — | — |
| 6 | Mir JIT compiler library | 6 | 10 | 38% | 6 | — | — |
How we rank
Rank is the number of separate people who recommend a product in a Hacker News comment over the past year. Someone who praises the same JIT compiler in five threads counts once.
The badge goes to JIT compilers that at least 10 people recommend, with recommenders outnumbering critics at least 2 to 1, recommended in at least 4 of the 13 months.
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