---
title: "Fix: PhantomJs, YSlow and Loadspeed load pages very slowly on windows machines"
url: "https://osherove.com/blog/2013/6/10/fix-phantomjs-yslow-and-loadspeed-load-pages-very-slowly-on.md"
canonical: "https://osherove.com/blog/2013/6/10/fix-phantomjs-yslow-and-loadspeed-load-pages-very-slowly-on.html"
published: "2013-06-10T12:50:52"
updated: "2013-06-10T12:50:52"
tags: ["Tips & Tricks"]
author: "Roy Osherove"
description: "I was running into this problem. We were using phantomjs to run speed tests and weight tests for our web pages, and it all worked well on my machine. Then it worked VERY slowly (five times slower!) on the build agent.…"
usage: "Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page)."
license: "https://creativecommons.org/licenses/by/4.0/"
---

# Fix: PhantomJs, YSlow and Loadspeed load pages very slowly on windows machines

By Roy Osherove June 10, 2013 In [Tips & Tricks](https://osherove.com/blog/category/tips-tricks)

**Historical article** · Originally published June 10, 2013; technical details may be outdated.

I was running into this problem. We were using phantomjs to run speed tests and weight tests for our web pages, and it all worked well on my machine.

Then it worked VERY slowly (five times slower!) on the build agent.

The fix was simple, once I [single handedly googled it](https://plus.google.com/101758310571303591763/posts/9v9BMCJj2k6).

Go to Internet explorer on that machine.

- Click **internet Options**
- Click **Connections**
- Click **Lan Settings**
- UNCHECK “**Automatically detect settings**”

As an extra measure, you might want to disable IPV6 on the Ethernet adapter. Seems to fix it for some people.

## More in Tips & Tricks

[All posts in Tips & Tricks](https://osherove.com/blog/category/tips-tricks)

- Jun 25, 2012

    ### [HOW TO: Find the temp videos screenflow makes when uploading to vimeo and youtube](https://osherove.com/blog/2012/6/26/how-to-find-the-temp-videos-screenflow-makes-when-uploading.html)

- Aug 3, 2008

    ### [Before testing an addin - Reset Visual Studio’s previous addin knowledge](https://osherove.com/blog/2008/8/3/before-testing-an-addin-reset-visual-studios-previous-addin.html)


---

## About the author

**Roy Osherove**: Senior Solutions Architect at AWS working on AI for production and AI-driven development; author of The Art of Unit Testing and Elastic Leadership, with about 20 years of consulting and training on unit testing, TDD, team leadership and continuous delivery.

### Sites

- [RobotPaper](https://robotpaper.ai/): This blog: AI patterns and anti-patterns, AI and coding agents, and engineering leadership.
- [osherove.com](https://osherove.com): Roy's personal site. Author of The Art of Unit Testing and Elastic Leadership; consulting and training on unit testing, TDD, team leadership and continuous delivery, plus about 20 years of blog posts.
- [The Art of Unit Testing](https://www.artofunittesting.com): The Art of Unit Testing, 3rd Edition (Manning): readable, maintainable, trustworthy unit tests, plus TDD workshops in C#, JavaScript, Java and Kotlin.
- [5whys.com](https://www.5whys.com): Roy's writing on software team leadership: self-organizing teams, surviving chaos, learning mode and the Elastic Leadership model.
- [Pipeline Driven](https://pipelinedriven.org): Continuous delivery and DevOps practices: build patterns, pipeline-friendly testing, DevOps metrics and enterprise DevOps.
- [Elastic Leadership](https://www.elasticleadership.com): Elastic Leadership, Roy's framework for software team leaders (survival, learning and self-organizing modes).

### Social

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- LinkedIn: https://www.linkedin.com/in/osherove/

### Contact

- Contact form: https://forms.gle/jQSx5KoXvrVA1JCK7

### License

Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page). License: https://creativecommons.org/licenses/by/4.0/