The art of tuning a website to deliver it's content quickly and efficiently to the user over a potentially low bandwidth connection.

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0
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0answers
34 views

Does image dimensions outside image tag also slow page loading?

I am using height and width for images in css before img tag (css in same page header) so I think there is no need to set dimensions in img tag. But when I checked speed in different online tools, ...
0
votes
1answer
21 views

Is there any way to combine multiple images on the fly and download

Is there any way to compress/combine multiple images on the fly so that the browser has to download one single file. And after download is finished then uncompress using JavaScript and then display on ...
1
vote
3answers
57 views

Best practice how to specifiy the link's destination

In my website, I have many files such contact.php, about.html etc. Right now I can call those file in my site by two methods. Method 1: <a ...
1
vote
1answer
63 views

How to manage the leverage browser caching for third party JS files? [duplicate]

Is it possible to set and expiration date for the file http://assets.pinterest.com/js/pinit_main.js? And the other stuff down the list? I want to bring up my score as high as possible. I'm using ...
1
vote
3answers
254 views

Confused about missing width and/or height attributes

So I tested my site on https://gtmetrix.com and it said: The following image(s) are missing width and/or height attributes. I'm confused by this, because the images itself already have the correct ...
0
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1answer
47 views

Reducing waiting delay to webpage rendering time?

I ran a few tests on my website at webpagetest.org and while the Time to First Byte is under 200ms, it seems that in all tests I have run in different browsers at different locations, the page is ...
1
vote
2answers
68 views

When do browsers clear cache and how can I make more use of 304 responses?

I have a website with some some content which changes frequently. I would like to benefit from good caching when this doesn't change (so would ideally use a longer Cache-Control header), but would ...
1
vote
1answer
22 views

Full Boostrap from CDN vs custom version from own server

The last few versions of Twitter Bootstap can be customized to include only the components you need. The full version, with all the components, can be served from a wide variety of public CDNs ...
1
vote
1answer
1k views

requests with http://. should I block?

I took a look at my logs and found out that earlier this year, random computers made a request to resources and my log recorded it as follows: "GET http://testp3.pospr.waw.pl/testproxy.php HTTP/1.1" ...
0
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1answer
28 views

Looking for a reliable consistent site testing tool

I've been using GTMetrix for a while now but have noticed that the results are very inconsistent - and sometimes just wrong. Gidnetwork will show compression working perfectly and GTM continues to ...
1
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0answers
48 views

CSS Above or Below Body for Speed? [closed]

I just have a genuine question, should I put any CSS above or below the body tag (maybe for Javascript too?), and what are the pro's and con's of each method? and what's the (dis)advantages of using a ...
1
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3answers
52 views

How to test the speed of my server inet connection?

The connection speed our webapp is showing (from my office) is much slower than my connection speed to a SpeedTest.net site in the same city. I can test my internet using SpeedTest.net to Houston ...
1
vote
5answers
251 views

How to make US websites faster in China?

We've been troubleshooting our site's performance in China. We've removed a lot of the scripts that were slowing pages down. Two critical things we can't simply remove are Google Analytics and Google ...
2
votes
2answers
47 views

Caching a changing site

I run a website where the static content changes at least 4 times a week and I'm trying to figure out the best header arrangement to use. Currently I have all caching related headers in use. I have ...
1
vote
1answer
84 views

Does the load time of an XML sitemap matter?

I have a dynamic sitemap that will change on a daily basis. Because I'm hosting on Heroku, I'm having some difficulty getting it to persist. I'm considering having the sitemap generate on request, ...
0
votes
1answer
29 views

Google Webmaster Tools is reporting that some URLs listed my sitemap have a high response time [duplicate]

In Google Webmaster Tools looking at a new clients site, I'm seeing sitemap errors that I haven't seen before with this message: Some URLs listed in this Sitemap have a high response time. This ...
2
votes
2answers
103 views

How to improve load time when Pingdom says 80% of the load time is the web browser waiting for data from the server? [closed]

tools.pingdom.com gives a speed analysis of any given website. What does it mean when most of the load time is spent on waiting? I am using a CDN.
2
votes
1answer
52 views

For SEO, can content containing keywords be written into the page using JavaScript and still rank well?

We have a list of product summaries that appear on several different product listing sections of our website. Currently, these products are rendered into the HTML, and end up in different caches ...
0
votes
2answers
103 views

Improve load speed of web page with many images [duplicate]

I own an ecommerce website built with Magento that has many images in the homepage for promotional banners. What is the best way to improve load speed? Reducing the file size sacrifice quality, so is ...
1
vote
0answers
42 views

Website Speed Index for SPA applications

I have a large SPA website, when measuring performance is there a standard metric to measure the time to transition between virtual pages? I know about speed index, but that only seems to cover ...
1
vote
1answer
33 views

What are the performance implications of loading static files as links vs. sending everything (including static files) inline

I was wondering what would be faster: Loading Static Files vs. Sending everything (including static files) in one HTML file? For example if I had a page that needs: jQuery font awesome CSS I ...
1
vote
1answer
63 views

Website Performance Testing Tools [closed]

I have a contract before me that says our client will use "the following metrics will be used to determine performance standards" of the MVC4 based web site we want to deploy for them. I am looking ...
5
votes
2answers
159 views

What is “blocking time” in Chrome browser?

According to the answer of http://stackoverflow.com/questions/15597936/blocking-time-in-google-chrome: "Blocking" is the time the request spent waiting for an already established connection to ...
2
votes
2answers
54 views

For performance reasons: have different pages for search engines and users

I have a SEO question for single page applications. We're working on a SPA (not yet public) that displays tables of numeric data to users. The data volume is large, number aggregations are costly ...
38
votes
6answers
5k views

When webservers send a page, why don't they send all required CSS, JS, and images without being asked?

When a web page contains a single CSS file and an image, why do browsers and servers waste time with this traditional time-consuming route: browser sends an initial GET request for the webpage and ...
3
votes
1answer
179 views

What if one certain page is much slower than the rest of your website?

I have a very fast website, but there is one overview page that queries a lot and takes 16 to 17 seconds to load. Will this have an impact on my SEO?
3
votes
1answer
44 views

What are the effects on loading times when conditionally loading and concatenating scripts?

Suppose you have a script in your theme that you always need on every page - say 'animate-menu.js' (10KB) - and you have one that you only need on one specific page - say 'validate-contactform.js' ...
8
votes
1answer
613 views

Improve web site performance via parallel CSS downloads?

I was optimizing the page load time of a website. One of the ways was by combining multiple HTTP requests for CSS into one combined HTTP request. But one of the reviewers asked an interesting ...
1
vote
1answer
501 views

Can .htaccess be used to cache AdSense JavaScript to improve the pagespeed score?

I'm AdSense publisher and I need to improve the page speed score for my site. It already gets 90/100 for speed and 100/100 for User Experience, however Google AdSense code is preventing it from ...
1
vote
3answers
176 views

InstantClick effect on SEO?

InstantClick.io is a pretty awesome JS library that makes a website feel a lot faster (in most cases) by prefetching links when a user is hovering above them. This will cut off at least about 100ms ...
6
votes
3answers
313 views

What's causing the 'wait' time before my HTML loads?

I have a website the seems to load very slowly. When I run a speed test on it I see there seems to be a 6 secound gap before the HTML loads. Images and JS scripts load very fast after that point. You ...
5
votes
3answers
3k 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 ...
3
votes
2answers
198 views

What's the minimum age for a Cache-Control header with Akamai?

We're planning an integration with a CDN (likely Akamai) and are trying to determine how low we could go for a max-age value. For a site that could get a few hundred thousand folks hitting the site ...
2
votes
1answer
104 views

Performance hit of a lot of unused font-faces

If you have an html file, and in that html file you link to styles.css which covers all the styling of the page. Then inside of styles.css you have something like @import url('../css/fonts.css'). ...
1
vote
1answer
121 views

Why does bingbot access my sites the most even if I set crawl rate to the minmum?

Recently my sites got overloaded and it turned out bingbot was the culprit. I set the crawl rate for the minimum for my sites in bing webmaster tools, but regardless bingbot has the most access (about ...
2
votes
1answer
55 views

Is there any way to simulate a slow connection between my server and an iPad (without installing anything on the server)?

Some of our webapp users have difficulty on slower connections. I"m trying to get a better idea of what that "speed barrier is" so I'd like to be able to test a variety of connection speeds. I've ...
2
votes
6answers
102 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 ...
1
vote
2answers
55 views

How do I pick a host with the fastest access to a third party API?

I'm developing an application that relies on an API that is very time-sensitive. Every millisecond advantage I have over my competitors the better. Is there a good way to determine the optimal ...
2
votes
1answer
2k views

How do I fix “high response time” warnings from Google Webmaster Tools? [duplicate]

In my Google Webmaster Tools account, there is warnings about my site: Some URLs listed in this sitemap have a high response time. This may indicate a problem with your server or with the content ...
0
votes
2answers
70 views

Dynamically load CSS

I'm using LESS for creating CSS and I'm considering using something like grunt-render on the server side in order to only load the CSS / JS that is needed for that page. My goal is to reduce overhead ...
1
vote
3answers
541 views

“High response time” warnings in Google Webmaster Tools

In my Google Webmaster Tools account, there are warnings about my site. Some URLs listed in this sitemap have a high response time. This may indicate a problem with your server or with the content ...
2
votes
1answer
79 views

Why requests/Sec is very low in jmeter benchmarking while website serves so many users?

I've created a Thread Group to test my server load. In the following picture you can see that throughput is about 27 per min. The site is a high traffic website. Is jmeter precise on showing this ...
1
vote
2answers
794 views

Google Pagespeed not recognizing minify, cache leveraging, etc

Recently, my sites score completely dropped in site optimization/speed in the Google Adsense rating system. When using Google PageSpeed Insights it tells me quite a few things. One being to leverage ...
1
vote
1answer
37 views

What kind of increase can I expect from improving site speed

I have a pretty slow site. This is what WMT measured: Now I know speed is a factor in SEO, but considering it is very difficult to make the site faster, I'm trying to evaluate the ROI of this effort. ...
0
votes
1answer
43 views

SEO / Perfomance domain matters

If I register a domain by some domain registrar and than host in on some hosting provider, does the SEO or performance matter? E.g. I register the domain in UK and then host in Dallas, are there any ...
0
votes
1answer
96 views

Declaring variables using single or multiple var statements. Performance wise [closed]

Someone once told me that it's better for Javascript performance to use one var statement rather then multiple. I.e. // Version A. Allegedly Faster var a = 1, b = 2, c = 3; // Version B. ...
3
votes
2answers
286 views

Can using Varnish still help to improve the performance of my site if I already use CloudFlare?

I'm using CloudFlare right now. Can Varnish still help to improve the performance of my site?
0
votes
1answer
48 views

Is my website is too slow? [closed]

I checked the speed of my website with http://tools.pingdom.com/ . Results: Per. Grade = 85/100 Req.s = 18 Load Time = 1.94s Page Size= 96kb Is this result is good for my website(also consider ...
2
votes
1answer
790 views

Can I set Cache-Control in the .htaccess file for a specific part of a document (just a section of the <body>)

I noticed, by using Google Page Speed Insights, that if I structure my HTML to load the critical, above-the-fold content first, my page will improve performance - and it woks (with now current perf. ...
0
votes
2answers
1k views

Can I defer loading Modernizr?

I'm using an HTML5 template that makes thorough use of the semantic tags and includes Modernizr up top to do the necessary IE coaxing. Google PageSpeed is complaining about the blocking JavaScript and ...