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Published: 25 October 2008

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I found these 2 ways of optimizing load time of pages in Firefox Mozilla. Both work, the load times vary. I noticed the load time of pages has become faster and I have an ADSL2+ connection at 3 Mbit/s download and 384 kbit/s upload.
Found these 2 ways on some other sites I cant even remember. Hope it works for you as it is working for me now.

First way of optimizing Firefox

Firefox is in my opinion the best browser ever made until now. It includes:
-improved tabbed browsing
-pop up blocking
-integrated Goggle search
-enhanced privacy controls
-built-in phishing protection
-online spell checking
-lots of themes, interfaces, and extensions/addons

Mozilla Firefox officially supports:
-Microsoft Windows
-Linux
-Mac OS X

Unofficial Support:
-Free BSD
-OS/2
-Solaris
-SkyOS
-BeOS
-XP Professional x64 Edition

Now here are some Tips&Tricks that can help you double the speed of Firefox.

1. Type about:config in the address bar and then press Enter.

2. In the filter search bar type network.http.pipelining. Be sure the value field is set true,if not double-click to set true. HTTP is the application-layer protocol that most web pages are transferred with. In HTTP 1.1, multiple requests can be sent before any responses are received. This is known as pipelining. Pipelining reduces page loading times, but not all servers support it.

3. Go back to the filter search bar and type network.http.pipelining.maxrequests. Double-click this option and set its value to 8.

4. In the filter search bar and type network.http.proxy.pipelining. Once opened doubleclick on it and set it to true.

5. In IPv6-capable DNS servers, an IPv4 address may be returned when an IPv6 address is requested. It is possible for Mozilla to recover from this misinformation, but a significant delay is introduced.
Type network.dns.disableIPv6 in the filter search bar and set this option to true by double clicking on it.

6. CONTENT INTERRUPT PARSING
This preference controls if the application will interrupt parsing a page to respond to UI events. It does not exist by default. Right-click (Apple users ctrl-click) anywhere in the about:config window, select New and then Boolean from the pop-up menu. Then:
A. Enter content.interrupt.parsing in the New boolean value pop-up window and click OK
B. When prompted to choose the value for the new boolean, select true and click OK.

7. Rather than wait until a page has completely downloaded to display it to the user, Mozilla applications will regularly render what has been received to that point. This option controls the maximum amount of time the application will be unresponsive while rendering pages. Right-click (Apple users ctrl-click) anywhere in the about:config window, select New and then Integer from the pop-up menu.
A. Enter content.max.tokenizing.time in the New integer value pop-up window and click OK
B. You will be prompted to enter a value. Enter 2250000 and click OK.

8. CONTENT NOTIFY INTERVAL
This option sets the minimum amount of time to wait between reflows. Right-click (Apple users ctrl-click) anywhere in the about:config window, select New and then Integer from the pop-up menu.
A. Type content.notify.interval in the New integer value pop-up window and click OK.
B. You will be prompted to enter a value. Enter 750000 and click OK.

9. CONTENT NOTIFY ONTIMER
A. This option sets if to reflow pages at an interval any higher than that specified by content.notify.interval. Right-click (Apple users ctrl-click) anywhere in the about:config window and select New and then Boolean from the pop-up menu.
B. Type content.notify.ontimer in the New boolean value pop-up window and click OK.
C. You will be prompted to choose the value for the new boolean. Select true and click OK.

10. Notify Backoffcount
This option controls the maximum number of times the content will do timer-based reflows. After this number has been reached, the page will only reflow once it is finished downloading. Right-click (Apple users ctrl-click) anywhere in the about:config window and select New and then Integer from the pop-up menu.
A. Enter content.notify.backoffcount in the New integer value pop-up window and click OK.
B. You will be prompted to enter a value. Enter 5 and click OK.

11. CONTENT SWITCH THRESHOLD
You can interact with a loading page when content.interrupt.parsing is set to true. When a page is loading, the application has two modes: a high frequency interrupt mode and a low frequency interrupt mode. The first one interrupts the parser more frequently to allow for greater UI responsiveness during page load.
The low frequency interrupt mode interrupts the parser less frequently to allow for quicker page load. The application enters high frequency interrupt mode when you move the mouse or type on the keyboard and switch back to low frequency mode when you had no activity for a certain amount of time. This preference controls that amount of time. Right-click (Apple users ctrl-click) anywhere in the about:config window and select New and then Integer from the pop-up menu.
A. Enter content.switch.threshold in the New integer value pop-up window and click OK.
B. You will be prompted to enter a value. Enter 750000 and click OK.

12. NGLAYOUT INITIALPAINT DELAY
Mozilla applications render web pages incrementally, they display what’s been received
of a page before the entire page has been downloaded. Since the start of a web page
normally doesn’t have much useful information to display, Mozilla applications will wait
a short interval before first rendering a page. This preference controls that interval. Rightclick (Apple users ctrl-click) anywhere in the about:config window and select New and then Integer from the pop-up menu.
A. Enter nglayout.initialpaint.delay in the New integer value pop-up window and click OK.
B. You will be prompted to enter a value. Enter 0 and click OK.

Second way of optimizing Firefox:

1. Type "about:config" into the address bar and hit enter. Scroll down and look for the following entries:

2. Alter the entries as follows:

Set "network.http.pipelining" to "true"
Set "network.http.proxy.pipelining" to "true"

set "network.http.pipelining.maxrequests" to some number like 30. This means it will make 30 requests at once.

3. Lastly right-click anywhere and select New-> Integer. Name it "nglayout.initialpaint.delay" and set its value to "0". This value is the amount of time the browser waits before it acts on information it recieves.


More options:

For ADSL:
1. Type: about:config
2. Set:
network.http.max-connections : 64
network.http.max-connections-per-server : 21
network.http.max-persistent-connections-per-server : 8
network.http.pipelining : true
network.http.pipelining.maxrequests : 100
network.http.proxy.pipelining : true

3. Lastly right-click anywhere and select New-> Integer. Name it "nglayout.initialpaint.delay" and set its value to "0". This value is the amount of time the browser waits before it acts on information it recieves.