Firefox very slow on localhost connections on Vista

Doing web development on my local machine – a Vista box – I was wondering why page rendering was so slow. First I thought my web application was not well done. But then I figured out that the pages rendered lightning fast on IE 7. And again later, I experienced, that the web application rendered pretty fast even in Firefox, when published to the live server.

Doing some research I found this blog entry, which was quite helpful.

The change of the Firefox setting network.dns.disableIPv6 to true did the trick. See screenshot below:

sshot.png

More information about this setting is to be found in the MozillaZine Knowledge Base.

Published in: on March 27, 2007 at 11:45 am  Comments (36)  

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  1. On March 27, 2007 at 4:18 pm Firefox very slow on localhost connections on Vista « Hotware: Dirk’s Software Blog said:

    […] 27th, 2007 Via JP’s codepoetry: Doing web development on my local machine – a Vista box – I was wondering why page rendering was […]

    Reply
  2. On April 17, 2007 at 11:37 pm Leigh Brasington said:

    Thanks! Setting network.dns.disableIPv6 to true fixed my problem, too.

    Reply
  3. On May 13, 2007 at 5:15 pm Ahmad Lafi said:

    I thought for a while that this is a trick by Microsoft to boost IE over Firefox. Thanks to you, your article proved that I was wrong.

    Reply
  4. On June 26, 2007 at 2:18 am Lance Fisher said:

    Thanks! This literally saved me tons of time. Well, maybe not so literally since time isn’t measured in tons, but it worked.

    Reply
  5. On August 23, 2007 at 11:25 am Bjarte said:

    You could have solved it by using 127.0.0.1 instead of localhost for firefox and VS development. But your tip is ofcause much better.

    Thanx

    Reply
  6. On December 13, 2007 at 4:26 am Eloff said:

    Thanks! I think the FF guys had better put a shortcut case in there to map localhost to 127.0.0.1 rather than do a seriously crappy IPV6 lookup.

    -Dan

    Reply
  7. On December 15, 2007 at 2:14 pm Idetrorce said:

    very interesting, but I don’t agree with you
    Idetrorce

    Reply
  8. On December 20, 2007 at 5:34 pm Melina said:

    very interesting. i’m adding in RSS Reader

    Reply
  9. On January 25, 2008 at 2:20 am Rebecca said:

    Thanks for the tip — this was bugging me forever!

    Reply
  10. On February 20, 2008 at 11:07 pm Viktar said:

    Thank you, I believe in Firefox again !!!!!!!

    Reply
  11. On February 21, 2008 at 3:13 pm Personal Bytes » Firefox slow on localhost connections on Vista? said:

    […] quick Google search led me to this. For some particular reason I’m yet to assert, Firefox gets stuck if IPv6 for DNS querying is […]

    Reply
  12. On April 3, 2008 at 1:32 pm Andrew said:

    If you’re experiencing this problem on Vista for localhost, there is a fix which seems less drastic. Look in your hostfile at the value for localhost, and comment out the ipv6 address, leaving only the ipv4. With no changes to firefox this got my localhost performance back to normal.

    Reply
  13. On May 11, 2008 at 10:26 am Carlos Guedes : Bug: Firefox lento em ligações locais said:

    […] Hoje decidi fazer uma pesquisa para ver se alguém tinha solução para este problema e encontrei a solução aqui. […]

    Reply
  14. On July 9, 2008 at 9:39 pm Scott on Writing said:

    […] configuration property to “localhost”. My search led me to many pages around the Web suggested that you set the nework.dns.disableIPv6 property to true, but this would disable […]

    Reply
  15. On July 9, 2008 at 11:03 pm Speeding Up FireFox When Using the ASP.NET Development Server from Localhost - Readed By Wrocław NUG members - Wroc.NET said:

    […] the network.dns.ipv4OnlyDomains configuration property to localhost. My search led me to many pages around the Web suggested that you set the nework.dns.disableIPv6 property to true, but this would disable […]

    Reply
  16. On July 23, 2008 at 2:39 am Zaibot said:

    I found another little work around that MUCH more usefull.
    Download Fiddler and set it up as proxy, this way you can monitor your traffic with the development server and it also get rid of the problem that it’s slow. 😉

    Greetz

    Reply
  17. On July 23, 2008 at 2:43 am Zaibot said:

    Ohyeah forgot one thing, turn off that Firefox doesn’t use the proxy for localhost and 127.0.0.1 ofcourse. And if you have trouble reaching the server, setup a custom startpage that’s pointing to 127.0.0.1 instead of localhost. 🙂

    Reply
  18. On August 29, 2008 at 11:44 am Ragnar said:

    Awesome!

    Reply
  19. On September 24, 2008 at 10:00 am Firefox very slow with Visual Studio and Vista | Smart red fox said:

    […] where credit is due – I found the fix here through my Google fu. This entry was posted in Uncategorised. Bookmark the permalink. Post a […]

    Reply
  20. On January 16, 2009 at 1:52 am Utku Altinkaya said:

    Thank you very much ! I was about to go crazy because of this.

    Reply
  21. On March 15, 2009 at 6:43 pm Babblr - DotNetBabbls: Lösung: Firefox ist sehr langsam unter Vista... said:

    […] ist sehr langsam unter Vista wenn die Applikation auf dem ASP.Net Development Server läuft. https://codepoetry.wordpress.com/2007/03/… vor 6 Sekunden per Web […]

    Reply
  22. On July 14, 2009 at 7:49 am HellRaider said:

    Thanks I really appreciate your tips

    Reply
  23. On August 19, 2009 at 2:50 pm Page Brooks said:

    Thanks, you helped me solve my problem in about 5 seconds!

    Reply
  24. On October 26, 2009 at 9:00 pm Orange said:

    Thanks, I was really worried something was wrong with my application, your information was very helpful…

    Reply
  25. On October 27, 2009 at 8:21 am Andreas said:

    Thank you very much. Solved it on my Windows 7 too!

    Reply
  26. On November 25, 2009 at 10:37 am dann said:

    thanks, this solved my problem also.

    Reply
  27. On December 15, 2009 at 12:12 pm Strzelecki.info » Blog Archive » Wolne działanie firefox’a dla localhost w Viście said:

    […] Źródło […]

    Reply
  28. On February 26, 2010 at 12:17 pm yemek tarifleri said:

    Thank you
    Solved my problem too

    Reply
  29. On March 13, 2010 at 12:28 pm CreOFF » Blog Archive » Is your FireFox slow? said:

    […] lookups? Several blogs reported that the reason might be slow IPv6 DNS lookups. If you type about:config and change the setting “network.dns.disableIPv6″ setting to […]

    Reply
  30. On March 30, 2010 at 11:20 pm Craig said:

    THANK YOU! Man, I was going nuts trying to optimize my site and then thought.. hey, let me try it in Chrome and then IE. They were both just as you described “lightning fast”! I made the change you suggested and BAM! I’m back in business. Thanks!

    Reply
  31. On March 31, 2010 at 6:51 am Dirk said:

    I would assume that disabling the IP V6 protocol from the network settings of your network card would do the trick, too. As long as you don’t have V6 in your network, disable V6 (it’s “on” by default since Vista).

    Reply
  32. On April 20, 2010 at 6:05 am bruce said:

    not only in Vista, i also have this problem in XP, and your solution works soooo finneeee, so, THANKS!!!

    Reply
  33. On June 24, 2010 at 3:00 pm internetagentur said:

    Thanks for the trick. It solved my problem with firefox on Win7 machine too.

    Reply
  34. On April 5, 2011 at 9:52 pm ferit said:

    Tanks you, it’s work windows 7 and firefox 4. Localhost no longer works very fast.

    Reply
  35. On May 2, 2013 at 5:36 pm touch screen gloves said:

    Everything is very open with a clear clarification of the challenges.
    It was really informative. Your site is extremely helpful.
    Thanks for sharing!

    Reply
  36. On November 11, 2013 at 9:42 am Firefox velmi pomalý při použití Windows Vista a ASP.NET Development serveru | HAVIT Knowledge Base said:

    […] návodu pomůže ve […]

    Reply

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