In the beginning of any Drupal project the site loads very quickly because there aren’t many modules installed. But as you add modules, the performance of the site will become slower and slower.
There’s always a certain point in the project where you realize it’s time to look at the problem and see if it’s a rogue module or some dodgy code, we’ve all seen this.
Trying to debug a performance issue can be tedious work. But often, it comes down to having too many queries loaded on a page.
If you’re on Drupal 7, just enable query logging using the Devel module. This will show all the queries generated at the bottom of the page.
But for Drupal 8 we have something better: Web Profiler.
Web Profiler is a Drupal 8 port of the Symfony WebProfiler bundle. The port is possible because Drupal 8 uses Symfony components.
Web Profiler adds a toolbar at the bottom of every page and shows you all sorts of stats such as the amount of database queries loaded on the page, which services are used and much more.
Now there’re a few other ways to profile your Drupal site. A popular one is to use XHProf and Devel integrates with it. You also have the XHProf module.
In this tutorial, you’ll learn how to install and use Web Profiler.
Getting Started
Web Profiler used to be its own project. However, now it’s part of Devel.
Go download the Devel module then install the Web Profiler sub-module.
Below are the Drush and Drupal Console commands to download and install:
Drush:
$ drush dl devel $ drush en webprofiler
Drupal Console:
$ drupal module:download devel --latest $ drupal module:install webprofiler
Install Libraries
Add highlight.js and D3.js
As far as I can tell these two JavaScript libraries are optional. Web Profiler will still work even if you don’t have these installed.
Highlight.js is used, as you can guess, to add syntax highlighting to code. You can see it used when listing out database queries.
To add highlight.js, just head over to its download page and click on the Download button in the “Custom package” section. Then extract the downloaded zip file into /libraries/highlight so the path to the library is /libraries/highlight/highlight.pack.js.
D3.js is used when viewing the Timeline page.
To add D3, just go to its homepage and download the library by clicking on d3.zip. Extract the zip file copy the d3 folder into the /libraries directory so it’s /libraries/d3/d3.min.js.
Using Web Profiler
One thing I like about Web Profiler is that it’s easy to setup. Just install the module and the toolbar will appear on the page. Straightaway you’ll be able to see useful information such as the query count, memory usage and more.
Here are two useful items which’ll appear on the toolbar.
Timeline
This shows you the time it took to render the page and memory usage.
If you click on the Timeline item and see an empty page it means you haven’t finished configuring it. You’ll need to add D3 and some code to your settings.php. You can grab the code from the “Displaying Timeline” section.
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