A well configured and optimized website can be highly performant and can handle multiple requests simultaneously. Likewise, a poorly optimized site can be slower for its users and will acquire more resources even to run a single query.
Below are some ways which can help you to optimize your Drupal website.
Images take more than half of the weight of a web page. So optimizing these images is a must.
Drupal8 has the ability to resize the images.
Note: The smaller the size of the images, the smaller the bandwidth it will require to load up, and the faster the website will be.
Always update the Drupal to its latest version. As with every update, it brings lots of features.
They keep removing the bugs, which, in return, can help to speed up your website.
Disable Unnecessary Modules
Keeping unnecessary modules can degrade your website performance as it will require/ consume memory, which can be used to optimize your website. Below are some modules which you may disable for your site.
Blog and Forum
Field, Rules and Views UI
Help and Shortcut
Color and Toolbar
Tracker and Statistics
Devel and Devel node access
Some of the errors, like website breaking and load image issues, may degrade your website performance. So to improve the performance, an error-free website is recommended.
There is one most common error, i.e., 404 error, it is an example of a broken link. It can be resolved by using external services like 'Online Broken Link Checker' or 'Screaming Frog.'
Always choose a hosting plan with the best servers like the E2E cloud.
It is essential to have a server with good performance and can handle multiple requests at a time.
Please do not go for a shared hosting service as they host multiple websites on a single server of different clients, which can make you share the necessary resources with another of their customers and can degrade the website performance.
You can go with VPS like E2E Networks. VPS with dedicated resources, and you can configure according to your requirements.
Lazy Loading feature.
Using the "Image Lazyloader" module provided by Drupal, you can effectively increase the website performance. Currently, this module has over 20,000 downloads, which makes it the most likable module for the developers. It increases the page load times by making sure that the image will only load when it is visible to the end-user.
Using the "Image Resize Filter" module, you can scale down the image so that you don't need to depend on CSS to scale the images when you use them on your website.
Use Caching Module
With the help of the caching method, one can improve the page loading speed exponentially. This method is used when someone visits your website from their browser. The only disadvantage is it depends on the cache stored in the clients' system, as they tend to clear the cache of their system on a regular basis.
Drupal8 has its built-in method to enable the cache. However, one can still install additional caching modules that make Drupal scales such as Page Caching, Views Caching, Panel Caching, PHP Caching, and Browser Caching.