GoKawiilJulia version 1.13 has been released. We want to thank all the contributors to this release and all the testers who helped find regressions and issues in the pre-releases. Without you, this release would not have been possible.
The full list of changes can be found in the NEWS file, but here we'll give a more in-depth overview of some of the release highlights.
Ian Butterworth, many others
Julia 1.13 takes roughly 30% less time to precompile packages than 1.12, and roughly 10-20% less time than 1.10 (LTS) depending on the machine.
Time To First X (TTFX), the time from starting Julia to getting a first result, is made up of three main costs: precompiling packages, loading them, and running the code. With the help of the community-submitted workflows at Julia-TTFX-Snippets, we have started measuring these costs more systematically on real-world examples and optimizing Julia against them.
The chart below shows the geometric mean across all 39 currently submitted workflows, on two machines. Precompilation is the fastest of 2 runs; load and execution times are the fastest of 3 runs.
This monitoring is now also part of Julia's own development process: new TTFX CI jobs run on relevant pull requests and on every commit to master , and the results are tracked at perf.julialang.org/ttfx. That tracking went live on September 7, 2026; measurements before then were ad hoc.
Julia 1.13 startup is also ~20% faster than 1.12.
% hyperfine --warmup 3 --runs 20 -N \ --command-name "julia 1.12" "julia +1.12 --startup-file=no -e ''" \ --command-name "julia 1.13" "julia +1.13 --startup-file=no -e ''" Benchmark 1 : julia 1.12 Time (mean ± σ): 69.1 ms ± 1.0 ms [User: 50.1 ms, System: 18.1 ms] Range (min … max): 68.0 ms … 72.6 ms 20 runs Benchmark 2 : julia 1.13 Time (mean ± σ): 56.7 ms ± 0.5 ms [User: 49.1 ms, System: 18.9 ms] Range (min … max): 56.0 ms … 58.1 ms 20 runs Summary julia 1.13 ran 1.22 ± 0.02 times faster than julia 1.12
Timothy, Kristoffer Carlsson
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