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docs: compare java-web with CheerpJ 5.0 on Java 25 in the README #80

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20 changes: 20 additions & 0 deletions README.md
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Expand Up @@ -52,6 +52,26 @@ See [docs/node.md](docs/node.md).

Details: [docs/support.md](docs/support.md).

## Compared with CheerpJ

[CheerpJ](https://cheerpj.com/) 5.0 takes the same page calls (`cheerpjInit`,
`cheerpjRunMain`), so the two can be compared on one page. Medians, measured
2026-11-08 in headless Chromium on one machine, with java-web 0.1.3 from npm
and CheerpJ 5.0 from its CDN. Cold means an empty browser cache; the downloads
are the runtime and JDK only, not the program's own jars.

| | java-web 0.1.3 | CheerpJ 5.0 |
|---|---|---|
| Java 25 | yes | preview |
| Hello world, cold | 0.55 s, 3.7 MB | 4.3 s, 10.8 MB |
| Hello world, warm | 0.17 s, nothing downloaded | 2.4 s, 3.8 MB |
| javac on a WPILib robot template, cold | 2.8 s, 7.4 MB | 10.1 s, 15.8 MB |
| The same at a tenth of one CPU | 96 s | 382 s |
| AWT and Swing windows | not yet | yes |
| License | AGPL-3.0 | free for personal, educational, evaluation and non-commercial open-source use, loaded from CheerpJ's CDN; business use needs a licence |

CheerpJ also runs Java 8, 11, 17 and 21, applets and JNLP; java-web runs only Java 25.

## Develop

You need Node 23.6+, pnpm, curl and bzip2 on Linux or macOS.
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