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WEB SCHOOL Top 9 Reasons Your Site is Loading Slow (And steps you can take to fix it)

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Chuck Aesthesia

New Contributor
Jan 7, 2021
Rosebank, Johannesburg
Okay so you might have heard that age-old adage which says “slow and steady wins the race”, but when it comes to the performance of your website, that certainly is a recipe for failure.

So Here are the Top 9 Reasons for Slow Loading Websites.

1. Unoptimized Images​

A large volume of unoptimized images is usually the most common reason behind website slowness. High-resolution images can consume lots of bandwidth while loading. Uploading larger sized images and then scaling them down can unnecessarily increase the size of your web page – causing your website to load slowly.

The image format is another important factor to consider.

For example, JPEG images are much smaller in size compared to other image formats like PNG or GIF. Quite naturally, your web page will load faster if you are using JPEG images instead of PNG/GIF.


  • Check the file size of your images, anything above 1MB is really unacceptable.
  • Use JPEG instead of PNG, especially for larger images. Icons are ok.
  • Use waterfall tests to easily scan image sizes and take corrective action.
  • Unoptimized images can cost you money in form of bandwidth overage.

2. JavaScript Issues​

The availability of JavaScript/jQuery plugins has made it really convenient to add dynamic content to websites. However, if implemented incorrectly, JavaScript can cripple your website’s page load speed.

It takes time for jQuery & JavaScript to be loaded, interpreted and executed. So if you are using multiple API calls to render JavaScript/jQuery data, it can result in significant delay while loading the web pages.


  • Script bloat is real. Audit your JavaScript scripts to see what you really need and remove what you don’t.
  • Asynchronous loading is a must.
  • Consider using something like segment or Google tag manager. A single script for all your tools!

3. Too Much Flash Content​

Although Flash is a great tool for adding interactivity to your website, it is highly likely contributing to your slow page load speed. Flash content is usually bulky in size and the bigger the file size is, the slower your pages will load.
Reducing the size of your Flash files or eliminating it altogether would improve your page loading speed significantly. If you are willing to make your website faster, you should look for HTML5 alternatives to replace your existing Flash content.


  • Flash is very bulky and is not good for performance.
  • Flash used to be cool. It’s not anymore.
  • Look for HTML5 replacements.

4. Excessive HTTP Requests​

Having loads of JavaScript, CSS, and image files can lead to too many HTTP requests. When a user visits your web page, the browser performs several requests to load each of these files – which can significantly reduce the page load speed.


  • Use Sprites to reduce HTTP requests.
  • Reduce the number of files on your pages where possible. Includes CSS, images, javascript.
  • Minify your CSS and Javascript files reduces # of total files users will have to download.

5. Not Making Use of Caching Techniques​

Caching is known to improve the performance of websites by leaps and bounds. If you’re not caching, you’re missing out. It’s a technique that let’s you store frequently used data points in the ‘cached memory’.
Any subsequent requests for the same content gets served from the cached memory, thus speeding up the whole data retrieval process.
By implementing browser/HTTP caching and server-side caching, you are likely to experience a huge improvement in the performance of your website.


  • Caching drastically improves performance.
  • You can cache a bunch of things from HTTP, Database Queries, to images.
  • If you can cache something, do it. But do it carefully so you don’t mess something up. It can be tricky.

6. Unclean Code​

Another common culprit for website slowness is unclean coding. When you make your website, excessive white spaces, inline stylings, empty new lines and unnecessary comments can make the website stylesheet grow larger in size.
By removing these unnecessary elements, you can compress the code, reduce the file size and improve the overall page load time and if you’re tracking rankings you’ll probably see a boost in your SEO performance too. In technical terms, this process is known as minifying. If you are not comfortable with coding, there are several online tools that can be used to clean and minify your stylesheet files. Alternatively, you can use a helping hand of some IT services providers.


  • Attention to detail matters.
  • Don’t be lazy and use inline CSS
  • Try not to create multiple CSS stylesheets when you can use a single one.
  • Minify!

7. Not Using gZIP Compression​

By enabling gZIP compression, you instruct the server to wrap all the web objects (images, CSS, JavaScript files etc) in a single container before they are sent over to the requesting browser.
Compression lowers response time by reducing the size of data being transferred between your server and the visitors’ browser, which in turn helps in serving the requested content much faster.
If you are yet to enable gZIP compression on your website, then it’s the first thing you should do without wasting any further time.


  • gZIP compression is an easy performance win.
  • It wraps up all your web objects (images, CSS, jS) in a single container to be sent to requesting browser

8. Too Many Ads​

No doubt display advertisements are great for monetizing high traffic websites.
But that shouldn’t come at the cost of compromised performance or user experience. Don’t let too many ads be another reason why your website is slow!

The most obvious impact of overloading your website with advertisements is the addition of HTTP requests, which would need additional processing time.
Especially the rich media ads – like pop unders, interstitials and auto downloads – may create hundreds of HTTP requests making your website unresponsive.
To sum things up, limiting the number of display advertisements will ensure better performance for your website. However, there may be some creative options outside of limiting ads. The team at gaming site solitaired, for example, experimented with loading ads based on a timed delay on when users started playing their solitaire game. As a result, page speed improved and they were able to maintain ad revenue.


  • Advertisements are additional HTTP requests and slow down page loading time.
  • Use them only where you need to, it will improve performance, UX, and CTR'S to your site

9. Not Using a CDN Service​

A CDN service is a distributed network of independent servers deployed in different geographic locations, that can serve web content to visitors with high availability and high performance.
Depending upon the geographic location of your visitor, the requested content gets served by the node located at the nearest available data center. It would minimize the round-trip-time (RTT) and serve the requested content in a much quicker time.


  • Not mandatory, but CDN can help. Especially if you have visitors from around the world.
  • CDN caches frequently accessed data in geographically distributed datacenters.
  • They can help minimise round-trip-time (RTT) and serve content faster for your audiences.


Website page load speed depends on a variety of factors such as unoptimized images, a high number of HTTP requests, bulky codes, and JavaScript issues to name a few.
So if your web pages aren’t fast, everything else suffers.
Every millisecond can make the difference, optimizing your server for class-leading performance is now more important than ever before. So yeah, I've tried to figure out and compile these reasons, hope that they are helpful !

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Read Millionaire Fastlane
Jun 15, 2018
What's the point of copying old article (with very questionable quality) from the internet and puting it here without giving a source?


eCommerce Development Consultant -
Read Millionaire Fastlane
Nov 13, 2017
Dublin, Ireland
Adobe Flash? Are we in 1998?
It looks like an outsourced link building article from Fiverr

If you've a WordPress site and limited budget install WP-Rocket. Its fairly simple to setup and gets the biggest bang for your buck. Also worth looking at ShortPixel, CloudFlare etc.

But if your after a bigger bang, and looking for a proper maintenance / hosting package get in touch with me.
We start at €250 ex vat per month on our custom stack.
My own site below 100/100 on Google Pagespeed


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