We will be testing on a WordPress 4.8.1 with no optimizations or plugins except WooCommerce 3.1.1 installed as Divi features extensive WooCommerce compatibility and this is where performance really helps with: selling stuff. While we are at it let’s pit our performance optimized Divi against superfast Storefront for fun and reference.
Storefront is done by Automattic, the guys that maintain WooCommerce itself, and can be considered the default theme for WooCommerce. It is known to be sleek and fast. A worthwhile competitor for Divi.
We will use Storefront as a reference to see what concatenation does to a theme when examined with PageSpeed Insights and Pingdom. This will hopefully set the Divi performance update into perspective and help us to better evaluate its quality.
With Autoptimize enabled, Storefront performs actually worse on Google’s PageSpeed Insights. It is complaining about Reducing server response time then, which is higher now because the server has to do more work concatenating and minifying files. Autoptimize really shines in conjunction with caching available and when multiple plugins need to be concatenated. In our test-setup neither is the case.
Pingdom transparently shows us what Autoptimize really does though. It reduces requests by 52% (from 28 to 15), load time by 11.58% (from 829 to 733 milliseconds) and page size by 1.7% (from 470.5 to 462.5kB).
But this is all just in order to get attuned to the topic. Now on to the real question: how cool is the Divi Perfomance Update when put to the test.
Pingdom w/o Autoptomize
How Page Speed Insights can possibly consider a page 10.98% worse on mobile while requests have dropped by 39.29% at the same time is beyond me.
Pingdom again provides details on what Autoptimize did with the site. It reduced requests by 39.29% (from 28 to 17), increased load time by 2.45% (from 940 to 963 milliseconds) and reduced page size by 1.1% (from 555.4 to 549.3kB).
Storefront is a minimal theme by design. Automattic‘s business model is to sell extension-subscriptions for otherwise free WooCommerce. Would be bad if their standard theme would cover much functionality, right? The more surprising, that Storefront and performance optimized Divi show comparable results when put to the test.
Oh, and Google PageSpeed Insights is a weirdo.
Are you as impressed with Divi‘s performance as I am or do you read those results differently?