Speed Optimization Tricks

Website speed is a crucial factor in increasing conversions.

An eCommerce store that takes forever to load loses many potential customers and fails to survive in the highly competitive market.

  • Add caching
  • Always do multiple measurements (more than 2)
    It’s important to make sure that data you collected are consistent. If you can see a major gap between measurements then something is not right, and therefore, you need to investigate a cause and repeat a test.
  • Conditions of speed tests must be the same
    Every time you are running tests make sure nothing changing externally. Some examples of external conditions could be the Internet speed, load of test server, etc.
  • Use Preloading & Lazy Loading
  • Use AMP
  • Refactor/Minify CSS
    it’s easy to build up technical debt in your CSS files over the course of a site’s development. Refactoring and simplifying your CSS will not only save on stylesheet size, but also make the site more maintainable and consistent for visitors.
  • Replace background images with CSS
    CSS can do some pretty awesome stuff these days. If you’re currently using tiled images for background images, consider replacing them with a CSS background.
  • Put CSS at the top and Google Fonts, jQuery libraries and Javascripts at the bottom
    Putting stylelsheets in the document head of the page prohibits progressive rendering, so browsers will block rendering to avoid having to redraw elements of the page. In most of cases, users will face a white page until the page is loaded completely. This also helps you to make a standard web page according to W3 standards. And, put your javascript code at the bottom of the page for the same reason
  • Remove unused Javascript
    It's The FIRST Email! The welcome email. They are so important that they result in four times more open rates and five times more clicks. As soon as a new subscriber signs up, sending them an email welcoming them onboard will likely get you 320% more revenue long-term than promotional emails short-term.

    Remember - it's all about the long-term, that's why a customer's LTV (lifetime value) matters the most. It might not make the most sales, but it tells your audience what they can expect to further receive and gives you a chance to better connect with them.
  • Minify JavaScript
    Combine up JavaScript, remove whitespace and comments to reduce the file size.
  • Load JavaScript deferred
    Loading JavaScript deferred eliminates render-blocking JS on your site and can improve load time.
  • Compress your JPGs, GIFs and PNGs, but always use WEBP or AVIF
  • Use a CDN service
    Store your static files (CSS, JS, images) in another server for quicker loading time.

The first 5 seconds of page loading time has the highest impact on the stores’ conversions.


70% of buyers admitted that a website’s speed impacts their decision to purchase from a store.


47% of users expect the websites to load in 2 seconds or less.


40% of the audience exit the website if it takes more than 3 seconds to load.

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