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Firefox too slow to respond

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Firefox too slow to respond

Hi,

My OS is Windows Vista and I have used Firefox for several years with hardly no problems but for some months, starting with Firefox 14 (or 13?), it is now very, very slow. I use ADSL connection (broadband) with a speed of 6-8Mbit/s and the response time for Firefox is now around 120ms and receiving speed around 0.6Mbit/s. Sending is normal, though, with about 0.89Mbit/s. I also have Netscape Navigator 9 and Explorer and they are still fast, 7Mbit/s and 0.89Mbit/s (receiving and sending) and a response time of about 15ms. What have I done to solve the problem? This is what I have I tried:

- Searched for virus and trojans - Safe mode. - No add-ons. - No plugins. - No bookmarks. - Cleared cache and history. - Updated add-ons and plugins. - Shut down anti-virus and firewall. - Reinstalled with the Firefox button in the help menu. - Made a complete reinstallation after removing all profile files etc. - Changed the DNS servers. - Tried about:config and changed values

Yesterday I installed the Comodo IceDragon, that is almost identical to Firefox 15, and suddenly the speed was 7/0.89Mbit/s but, alas, only once for the Dragon and once for the Firefox. Then back to the normal 0.6/0.89Mbit/s. Is there anything more that I can do? Pleas bear in mind that both Netscape and Explorer are working perfectly and I do not receive any error messages.

Thanks in advance!

Lars Ahlberg Sweden

1 ACCEPTED SOLUTION

Accepted Solutions
SUMO Contributor

Re: Firefox too slow to respond

Poor performance in Flash-based speed tests can be related to add-on conflicts and certain Flash features. If you have not already tried these:

(1) Disable protected mode (Win Vista and Win 7 only)

See this support article from Adobe under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?

(2) Disable hardware graphics acceleration in Firefox and in Flash

(A) In Firefox, un-check the box here and restart:

orange Firefox button or classic Tools menu > Options > Advanced > General > "Use hardware acceleration when available"

(B) In Flash, see this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) For video issues, make sure your RealNetworks add-ons are the latest versions

4 REPLIES
SUMO Contributor

Re: Firefox too slow to respond

Poor performance in Flash-based speed tests can be related to add-on conflicts and certain Flash features. If you have not already tried these:

(1) Disable protected mode (Win Vista and Win 7 only)

See this support article from Adobe under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?

(2) Disable hardware graphics acceleration in Firefox and in Flash

(A) In Firefox, un-check the box here and restart:

orange Firefox button or classic Tools menu > Options > Advanced > General > "Use hardware acceleration when available"

(B) In Flash, see this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) For video issues, make sure your RealNetworks add-ons are the latest versions

New User

Re: Firefox too slow to respond

Thanks for the reply!

I tried (2) and unchecked the box but it did not help much, at times the reciving speed increased to about 1.2Mbit/s. BTW Netscape 9 is working perfectly with the same Flash version. Should not any problems with Flash also affect Netscape?

As for (1), I did find the file mms.cfg but please pardon my ignorance: How do I add the line "ProtectedMode=0" to it?

I also used diaxdiag to check the drivers but no troubles were detected.

Lars

Site Moderator

Re: Firefox too slow to respond

Which security software (firewall, anti-virus) do you have?

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that works.

New User

Re: Firefox too slow to respond

Hi again,

Thank you cor-el but I did not have to try your suggestion.

Suggestion (1) by jscher2000 solved the problem completely - I think. I located the file mms.cfg in C:\Windows\System32\Macromed\Flash and copied it to the desktop. Open it with WordPad, added the line ProtectedMode=0 and saved it. Renamed the original file mms.cfgBAK (just in case I would need it later) and moved the new file to the same folder. Restarted Firefox and tested it several times - 7Mbit/s! Yezzzzzz!!!

Thank you!

Lars