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YSlow

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.

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Latest public signals

Page copy revised 25 Oct 2026 from public sources. Refresh checks the live site and, when this entry has a GitHub repository, the latest release.

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Introduction

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.

Features

These items are quoted from public documentation fetched on 25 Oct 2026. Taken from repository README headings.

  1. Packaging: Copyright (c) 2012, Yahoo! Inc. All rights reserved. Copyright (c) 2013, Marcel Duran and other contributors. All rights reserved. Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.

Pros

Points stated in the public sources fetched on 25 Oct 2026:

  1. Published license: The GitHub repository lists BSD 3-Clause “New” or “Revised” License (BSD-3-Clause).

Cons

The pages fetched on 25 Oct 2026 do not publish a limitations list. That absence is not evidence that the tool has no drawbacks. Current issues are tracked at https://github.com/marcelduran/yslow/issues.

The fetched README did not include a fenced code example. Use the official documentation linked below.

Resources:

Pricing

The fetched text says:

Official YSlow Open Source Project Website.

No separate price list was found on 25 Oct 2026.

The fetched pages do not name a target audience. Decide fit from the official description and the feature list above.

Conclusion

YSlow is summarized by its public description as: “YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.”.

No GitHub release was available when this page was rebuilt.

This page was rebuilt on 25 Oct 2026 from yslow.org, github.com. It keeps only what those pages stated. Confirm the current product, license, and price on the official site before you adopt it.