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1. Check the Current Speed of the WebsiteThe first thing you will want to do is to analyze your current page speed. This allows you to track your improvement and ensure that any changes you make positively improves your page load times.There are many free tools out there for checking how long it takes to load your website. Here are a few of them:
2. Optimize Your ImagesKnow when to use the appropriate file format for your images. Changing to a different file format can dramatically decrease the file size of an image.
3. Don’t Scale Down ImagesAvoid using a larger image than you need just because you can set the width and height attributes of <img> elements in HTML.If you need a 100x100px image and you have a 700x700px image, use an image editor like Photoshop or one of these .
4. Compress and Optimize Your ContentThe task of compressing your website content can have a huge impact on reducing load times. When using HTTP compression, all of your web page data is sent in a single smaller file instead of a request that is full of many different files. You can also optimize and compress your JavaScript and CSS files by combining them and minifying the source code.
5. Put Stylesheet References at the TopMoving your stylesheet references to the <head> of your HTML document helps your pages feel like it is loading faster because doing so allows your pages to render the styles progressively. In addition, it doesn’t hurt that it’s the W3C standard.
6. Put Script References at the BottomBrowsers can only download two components per hostname at the same time. If you add your scripts towards the top, it would block anything else below it on the initial loading of the page. This makes it feel like the page is loading slower.To avoid this situation, place script references as far down the HTML document as possible, preferably right before the closing <body> tag.
7. Place JavaScript and CSS in External FilesIf your JavaScript and CSS are directly in your HTML document, they are downloaded every time an HTML document is requested. This, then, doesn’t take advantage of browser caching and increases the size of the HTML document.Always place your CSS and JavaScript in external files; it’s a best practice and makes your site easier to maintain and update.
8. Minimize HTTP RequestsWhen visiting a new web page, most of the page-loading time is spent downloading components of that page (e.g. images, stylesheets, and scripts).By minimizing the number of requests a web page needs to make, it will load faster. To reduce HTTP requests for images, one thing you can do is to use CSS sprites to combine multiple images.If you have multiple stylesheets and JavaScript libraries, consider combining them to reduce the number of HTTP requests.
9. Cache Your Web PagesIf you use a content management system that dynamically generates your web pages, you should statically cache your web pages and database queries so that you can decrease the strain on your server as well as speed up page rendering times.When you cache your page, it saves a static version of it to be presented to the user instead of recreating it every time it’s requested.For WordPress, check out WP Super Cache and W3 Total Cache (also read this WordPress codex entry on optimizing/caching WordPress). Drupal core has native caching.
10. Reduce 301 RedirectsEvery time a 301 redirect is used, it forces the browser to a new URL which increases page-loading times. If possible, avoid using 301 redirects.
Conclusion
Web page speed is a metric that should not be ignored if you are concerned about providing an optimal user experience. You should be baselining this now and then referencing your baseline to make sure it is constantly improving. You can do this through a custom report. These tips are generic but can help your site speed whether you are a boat dealer or a restaurant, so you should find use in them.