Page-Speed normally refers to the time it takes for a web-page to be presented to a browser in a "fully loaded" state.

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50
votes
8answers
21k views

How can I simulate a slow connection for page load?

I have a fast server, and a reasonably fast home Internet connection. How can I simulate my page loading on a slow connection?
15
votes
4answers
32k views

How do I set expiration headers for CSS, JS, and Images?

I have recently analysed my website with pagespeed addon on firebug. It suggested me to set expiration on CSS, JS and image files. I am wondering how do i do this?
14
votes
2answers
1k views

Ideas to improve website loading speed?

Are there any ways in which I can improve the loading speed of a website? I know that Google is really pushing loading speeds and with the popularity of mobile websites it's now imperative that sites ...
13
votes
1answer
4k views

What is recommended minimum object size for gzip performance benefits?

I'm working on improving page speed display times, and one of the methods is to gzip content from the webserver. Google recommends: Note that gzipping is only beneficial for larger resources. Due ...
12
votes
3answers
16k views

What's an acceptable “Avg. Page Load Time”?

Is there any industry rule of thumb for what's considered an unacceptable load time v. an OK one v. a blistering fast one? We're just reviewing some Google Analytics data and getting 0.74 Avg. Page ...
12
votes
4answers
2k views

Loading main javascript on every page? Or breaking it up to relevant pages?

I have a 700kb decompressed JS file which is loaded on every page. Before I had 12 javascript files on each page but to reduce http requests I compressed them all into 1 file. This file is ~130kb ...
11
votes
5answers
278 views

Should JavaScript referenced in the head section be served from the same hostname as the main document?

I was under the impression that for the best performance, Javascript should be treated as static content and served from a cookieless domain along with CSS files, images, etc. But Google says here: ...
11
votes
1answer
553 views

How is github so fast?

When you browse repositories on github ( for example https://github.com/mojombo/jekyll/tree/master/bin) it feels like it uses ajax and does not reload the whole page every time. However the url really ...
10
votes
3answers
5k views

How can I replicate Google Page Speed's lossless image compression as part of my workflow?

I love that Google's Page Speed is able to losslessly compress a lot of my images, but I'd love to make it part of my workflow, prior to uploading a site and making it live. Is there anything I can ...
10
votes
1answer
13k views

Character set not specified in HTTP headers error

When testing this page with Page Speed, I get the a Specify a character set error: The following resources have no character set specified in their HTTP headers. Specifying a character set in HTTP ...
9
votes
6answers
5k views

Is it possible to use asynchronous google adsense, i.e. non-blocking?

I know that there is a Asynchronous method of using Google Analytics but is there something similar for adsense? I can't find one from my current searches - I was wondering whether there is a common ...
8
votes
2answers
3k views

When to use and not to use ETags

I was just looking at our site on WebPageTest.org and one of their recommendations for speeding up a website is: ETag headers should generally not be used unless you have an explicit reason to ...
8
votes
1answer
574 views

Is gzip compression available for GitHub pages?

I'm using GitHub pages to host my site. While checking Google PageSpeed Insights, it recommends that I enable gzip compression. Since I have a static site hosted on GitHub, I'm not sure that is ...
7
votes
4answers
425 views

Tool to check resource load order

Is there a tool I can show clients that will take a page's HTML and show: a) the order in which external resources will load, b) which resources are blocked on other resources being downloaded? For ...
6
votes
2answers
3k views

Cache external static scripts?

In my never ending quest for a faster website, I thought perhaps I could cache some scripts. I'm using Yslow to rate my site, everything is pretty much A (which is great, our website on Pingdom loads ...
6
votes
1answer
831 views

Leverage browser caching on GitHub pages

After using Google's PageSpeed Insights for my site [ http://flashmallach.github.com ] the biggest error I'm still coming up w/ is leveraging browser caching. I found some solutions that suggest using ...
5
votes
3answers
226 views

Specifying image dimensions to improve browser performance

I recently ran an audit on my web site using Google Developer Tools. My images are all the same size (500 horizontal by 300 vertical pixels) so I thought it would be better if I left out the image ...
5
votes
4answers
327 views

Strategies for very fast delivery of webpages

I run a website Cucumbertown with an initial pay load of nearly 9KB zipped. All my js is delayed loaded with requirejs and modernizer is the only exception. Now all my webpages are Nginx cached ...
5
votes
1answer
582 views

Page Speed Online vs Chrome Extension

In optimizing a content blog of mine with the goal of achieving the highest page speed score possible for obvious reasons (user experience, SEO, etc..), the results I'm obtaining are throwing me for a ...
5
votes
2answers
376 views

Is it normal to have some huge anomolies in Google Analytics site speed tracking?

I've recently started using the new _trackPageLoadTime function in Google Analytics to measure page load times. However, I have noticed a few pages appear with a huge "Average Load Time". One page is ...
5
votes
3answers
564 views

Best practices when loading images for improving page loading speed

I am working on optimizing a page's loading speed. Here are some analytics: Notice how the images, although only accounting for 65% of the total size (1.1MB), are by far the slowest loading ...
5
votes
3answers
592 views

How do I set up Google PageSpeed Service for my site?

It seems I can't set up Google's PageSpeed Service. When I do it in the Google services panel, a message comes up like: "Your site may be directing live traffic." What can I do to resolve this and ...
5
votes
3answers
731 views

What guidelines should be followed when implementing third-party tracking pixels?

Background I work on a website that gets a fair amount of traffic, and as such, we have implemented different tracking pixels and techniques across the site for various specific reasons. Because ...
5
votes
1answer
144 views

Connection speed for a website from UK to Australia

I need to open a website only for Australian customers. The fact is that our provider's servers are all housed in the UK. What do you suggest is better? Leaving our website in the UK? Or buy a ...
4
votes
4answers
334 views

Prepare website for heavy traffic

A site of mine is going to be featured on a very popular tech blog. I already upgraded my server to handle the traffic. What other things should I be prepared for?
4
votes
5answers
240 views

Speeding up website“speed”?

We use Google Analytics to measure traffic on one of our websites (who doesn't?). One of the thing that strikes us is the "page speed" tab. It shows that our website takes on average 5.69 seconds to ...
4
votes
1answer
111 views

Does Google include the time to load images, for a single page, as part of the page speed?

we all know that Google's affects your page rank with the load time of a page. How? That's part of the secret sauce. But we know that page speed is a serious factor. So -> what is considered the ...
4
votes
2answers
196 views

Google Webmaster Tools - Why site performance graph goes up and down, even if the site has never changed?

This is my site 7 months graph from Google Webmaster Tools site performance util. As you can see the graph goes up and down, with big differences: less than 1 second up to 5 sec. Since I never ...
4
votes
2answers
489 views

Actual page load time vs. perceived one

You know how all around the web, people are pushing for smaller and smaller page load times ? They do so with good reason, especially with Google now factoring it in in their way to rank pages. It's ...
4
votes
1answer
93 views

Can I easily track site performance over time with Google PageSpeed?

Are there any implementations of the Google PageSpeed API that allow one to track the performance of a site over time?
4
votes
1answer
999 views

How to fix “Leverage browser caching” error from Page Speed plugin

I'm using the Page Speed Firebug plug-in to check my sites. But I don't know how to fix the "Leverage browser caching" error, since I don't know you specify a cache lifetime to the browser in images ...
4
votes
2answers
80 views

Mobile Browsers! Do they ignore `<noscript><img>` (Responsive Design with Framework Zurb Foundation (Interchange/Noscript))

Experimenting with Interchange Responsive Images I'm experimenting with Interchange by Zurb Foundation to serve various images versions to different devices. For example 200x100 for mobiles, 300x100 ...
4
votes
1answer
1k views

Effect on SEO of lazy scrolling on HTML comments

I am thinking about using a JS script that lazy loads HTML when scrolling ( http://ivorycity.com/blog/2011/04/19/jquery-lazy-loader-load-html-and-images-on-scroll/). I am not too sure about whether ...
3
votes
2answers
698 views

Images on a subdomain, hosted on the same server — will simultaneous downloads increase? (CDN)

Browsers only allow you to download a limited number of concurrent files from the same domain. Would a subdomain for images (basically as a content delivery network) on the same web hosting server ...
3
votes
2answers
94 views

How to solve 503 issue

I'm participating in a web project. It's a Joomla web page and it's gained a lot of visitors in the past months. Actually we are receiving donations each year to pay site's hosting and domain. The ...
3
votes
1answer
705 views

Page Speed Optimization Questions: defer parsing and specifying a char set?

Continuing to optimized a web site, I'm using Chrome's Dev Tool add-on for Page Speed. I've been able to do a good bit of performance tuning thanks to its suggestions, but these two have me ...
3
votes
2answers
6k views

Slow website response? How can I fix this issue?

I have pingdom monitor on my website: http://stats.pingdom.com/t68xhgex256f/375513 For North America (big target market) the response time is 1-2 seconds. This is far too slow. Is there anything ...
3
votes
1answer
98 views

What's the threshold for creating data URI in css?

I'm interested in benchmarking, or best practices. I have 10 icons on my website. They are all background:url(..) no-repeat; Assuming sprites are not the answer (for any god given reason) how big or ...
3
votes
2answers
143 views

Does url length have any impact on page load speed?

Our site has been doing fairly well in terms of load speed and so I don't want this to bring that down as a slower page load speed impacts SEO visits.
3
votes
2answers
344 views

Page Speed no longer working for Firefox 4?

Hey there, I love Google's little Page Speed tool, I've seen some wonderful speed advances on sites I've worked on because of it, but since I've upgraded to FF4 it doesn't seem to be in Firebug ...
3
votes
1answer
97 views

page load wait time on my machine is 55ms but on test websites like pingdom.com it is 1.5 seconds, why would this happen?

When I analyze the website's page load speed in Chrome I can see the wait time (where the return response files of the sever are being generated) is 55ms and total page load time is 1 second or much ...
3
votes
1answer
117 views

Site speed: less KB image vs. less HTTP request

I have an interesting problem, I guess... First of all, I want to use sprites, to reduce the HTTP request on my site. That is because I know it's better for SEO and it makes the site faster, most of ...
3
votes
3answers
475 views

Long 'Wait' Time for three php/CSS files. Is something blocking them?

I have been speed optimizing a Wordpress site to little effect. There are three files CSS-related php files from the Wordpress theme that are delaying page loads on the site. One of the three files ...
3
votes
5answers
497 views

How to test the speed of a page that is guarded behind login page?

For public page, I can use pingdom.com to calculate the response time/uptime of a page over a certain period of time. However, pingdom cannot time the response time of a webpage guarded behind a ...
3
votes
1answer
2k views

How to diagnose slow loading web pages?

Pages at my domain sometimes load very slow. The domain is registered at 101domain, server is in Europe. Reply from 91.185.209.164: bytes=32 time=60ms TTL=60 Reply from 91.185.209.164: bytes=32 ...
3
votes
1answer
156 views

Why SPDY-enabled pages are not loading faster?

I've just enabled the SPDY module on nginx, as explanained on the SPDY module site. I expected a speed enhacement on my site, but I haven't noticed it. Using Firefox 25 and Firebug, I tried to take a ...
3
votes
2answers
897 views

How can I make redirections cacheable to speed up load times?

Google PageSpeed says this: Avoid landing page redirects To speed up page load times for visitors of your site, remove as many landing page redirections as possible, and make any required ...
3
votes
1answer
217 views

Google crawlers screen size

Imagine a I have two types of images (A and AAA(heavier)) for the same website: depending on the size of the screen it will show one image or other. Now I'm wondering what images (A or AAA) loads ...
3
votes
1answer
59 views

Statistics about development of average connection speed and latency over the years

Are there any statistics about the development of average internet connection speed and request latency from households to major sites over the years? I find this information very useful for ajax ...
2
votes
6answers
94 views

Regarding improving site performance

I have an e-commerce website and have close to 9000 products in it with each product having 3 pictures at least. Now my site is loading at an average speed but I want to improve it, as I will be ...