WP Rocket vs SG Optimizer Cache Plugin[ Shocking Result]

WP Rocket is one of the best-paid cache plugins for WordPress. No doubt about it. Until a few years back, there were no free alternatives to WP Rocket.

But over the years SG optimizer got mature enough to give a tough fight to WP Rocket.

In fact, the SG optimizer has almost the same features that the WP rocket has and it’s free. So it makes sense to compare WP Rocket vs SG optimizer in this article and see which cache plugin has the edge.

But before we learn about the differences between SG Optimizer Vs WP Rocket, let us have a quick introduction to what Cache actually is.

What Is Web Cache?

Caching is a method of storing data in a computing environment. The stored data can be accessed online or offline later depending upon where the data is stored.

When a visitor visits your website, all files are fetched from the origin server. Those files are then stored either in browser cache memory or the server-side cache memory based on how you set the cache mechanism.

How long those files will be stored depends on how much time is set for the expiry of HTTP headers.

Next time, when the same visitor visits the same page, files are fetched from the cache memory instead of the origin server. That is why your website content will load very fast when it is fetching data from the cache as there is less load on the origin server.

Why Caching is required for WordPress sites?

By default, WordPress is very poor in loading speed without a caching plugin. Every time a visitor visits a page, WordPress makes database queries to the server. This makes the page loading speed very slow.

What a cache plugin does is that it stores the static HTML version of a web page in the browser or in their server RAM based on the cache mechanism you set.

No next time, when a visitor visits the same page, the server delivers the cached version of the webpage rather than a separate query to the database. Since there is no call to the server, the page loads very fast.

Those static cached files get deleted automatically when there is a change in the page or when you manually delete those. New files replace those deleted files with the updated page.

What Is WP Rocket

WP Rocket is one of the best-paid cache plugins for WordPress for many years. The company also owns the image optimization called ” Imagifyand a CDN service called ” Rocket CDN“. Both services you can integrate directly into the WP Rocket dashboard itself.

wp rocket vs sg optimizer

One of the best parts about WP Rocket is the simple and easy-to-use setup. With a very minimum setting, it can speed up your website.

The interface is also very intuitive and simple. Even a newbie can easily set up WP Rocket. This plugin has almost all the required features that a WordPress website needs to speed it up.

WP Rocket Cache Plugin

Do you know that if your website takes more than 3 seconds to load, you may lose up to 50% of your potential visitors? …

Features Of WP Rocket

Here are a couple of salient features of the WP Rocket plugin. Although the feature list is long but here in this article, we will only talk about the main features.

If you want to know about all features of WP Rocket then I would suggest you read this ” WP Rocket Review” article.

Features Of WP Rocket
Page caching
Cache Preloading
File optimization
Delay script execution
Remove unused CSS
Image lazy load
Font preloading
Cloudflare and other CDN integration
Varnish and Securi integration
Database optimization
Heatbeat control
Browser file-based caching
GZip compression

What Is SG Optimizer

SG Optimizer is one of the free alternatives to WP Rocket. Especially if you are hosted on Siteground, then you should use SG Optimizer rather than WP Rocket.

SG Optimizer is yet to roll out a version for all other hosts although you can use it with a few features disabled which will only work if your site is hosted on Siteground.

wp rocket vs sg optimizer

Siteground Optimizer or SG optimizer is a free plugin with more than 1 millions download and almost all 5-star ratings in the WordPress repository. It has almost all there features of WP Rocket.

On top of that, it can perfectly blend with the Siteground hosting environment to give you the best out of Siteground Hosting.

Here are the Siteground Hosting features that are integrated directly into the SG optimizer. The following features won’t work in any other hosting environment.

Siteground Optimizer
Best free cache plugin for WordPress

NGNIX Direct Delivery

NGNIX direct delivery is a unique feature of Siteground hosting that stores and delivers static contents like CSS files, Images files, Javascript files, and other static files directly from the server RAM instead of sending a query to the server.

Since RAM is much faster than SSDs so your website will load much faster. NGNIX direct delivery cache is flushed every 3 hours so that new contents are populated in the RAM

Dynamic Cache

This is different from the NGNIX direct delivery as the dynamic cache only stores the dynamic contents instead of the static contents that NGNIX direct delivery does.

However, both Dynamic cache and Direct delivery are powered by NGNIX only. Without a dynamic cache, every time a visitor visits a page, it would have sent a query to the database. That would have slowed down your website and CPU seconds/hr would have increased.


If your website makes a lot of database queries and a lot of API calls then Memcached can help you to make your site load faster.

The Memcached is a complex cache mechanism that stored data in the server RAM similar to other cache mechanism and increase the website load speed.

Features Of SG Optimizer
Page caching
File optimization
Delay script execution
Image lazy load
Font preloading
Cloudflare integration
Database optimization
Heatbeat control
Browser file-based caching
GZip compression
Image optimization
WEP image file generation

WP Rocket Vs SG Optimizer

Here is a head-on comparison between WP Rocket VS SG optimizer so that ou know what is there and what is not there in these plugins.

Feature ListWP RocketSG Optimizer
Page CachingYesYes
GZip CompressionYesYes
Cache PreloadingYesYes
Link PreloadingYesNo
Minify CSSYesYes
Minify JavascriptYesYes
Combine CSSYesYes
Combine JavascriptYesYes
Load Javascript deferredYesYes
Delay Javascript ExecutionYesNo
Remove unused CSSYesNo
Image optimizationNoYes
Lazyload imagesYesYes
WebP file generationNo Yes
Database optimizationYesYes
CDN integrationYesYes
Heartbeat controlYesYes
Securi and Varnish integrationYesNo
One to one supportYesNo
Free version available?NoYes

So you might have noticed from the above table that the difference between the feature sets of WP Rocket and the SG optimizer is not that huge to justify the price tag of $49.

In fact when we run the test with WP Rocket and SG optimizer, the difference in the speed is only some microseconds. Let’s look at the test results now.

SG Optimizer Vs WP Rocket: Test Results

We have run the following test in our staging environment with the latest version of WP Rocket, SG optimizer, and WordPress

For both the plugins we have to use the best possible setting with Cloudflare CDN for content delivery and Bunny CDN for image delivery.

We also kept the same test location for all tests with the default setting

With WP Rocket Only Installed

The following screenshot shows the result with WP Rocket only installed. We followed all the best settings mentioned in this article.

wp rocket vs sg optimizer
wp rocket vs sg optimizer
wp rocket vs sg optimizer
wp rocket vs sg optimizer

So as you can see that except for the Google Page Insights mobile version, every tool shows great results.

With SG Optimizer Only Installed

So as you can see that Siteground hosting and SG optimizer is the best combination for getting the best speed. We could not able to get the perfect 100 scores using WP Rocket but with only SG optimizer it was possible.

So my recommendation is that, if your site is hosted on Sitegrond, then only use SG Optimizer

wp rocket vs sg optimizer
wp rocket vs sg optimizer
wp rocket vs sg optimizer
wp rocket vs sg optimizer

With Both SG Optimizer And WP Rocket Installed

With both SG Optimizer and WP rocket installed, looks like it gives better results than only WP Rocket installed. But it is recommended not to use two cache plugins together.

Still, in case, if you want to use both the plugins together, make sure to turn off overlapping features so that there is no unexpected result.

wp rocket vs sg optimizer
wp rocket vs sg optimizer 12
wp rocket vs sg optimizer
wp rocket vs sg optimizer

Here is the result comparison in tabular form so that you can figure out which one is better for you.

WP RocketA871001.9 s0 ms.01
SG OptimizerA100100830 ms0 ms.01
SG+ Wp RocketA91100999 ms0 ms.01
GTMetrix Test

So from this GT Metrix test, it is very clear that if you install only SG Optimizer, it will make sure the site is 2X faster.

ConditionGradePage SizeLoad Time
WP Rocket81397 kb4.71 sec
SG Optimizer91382 kb2.62 sec
SG+ Wp Rocket91384 kb2.27 sec
Pingdom Tools Test

In the Pingdom tool test also WP Rocket performed the worst and shows that the SG optimizer is 2x faster than WP Rocket.

We did not put the Google page speed data in the tabular form but if you compare the images, it is clearly evident that in the Siteground Hosting platform, SG optimizer is the kind of cache plugin beating WP Rocket by a long margin.

If you want to use the SG optimizer and the WP Rocket together, you will get the same result when you use the SG optimizer alone. The choice is yours.

Conclusion: SG Rocket Vs WP Rocket

As you have noticed from the test result that even with WP Rocket, there is no drastic improvement over SG Optimizer. SG Optimizer is a perfect alternative to WP Rocket if your site is hosted on Siteground.

If your site is hosted on any other hosting platform, then the story could be different as SG Optimizer is only for Siteground.



Rajib is the Co-Founder and the Lead Product Analyst of RiansTech. A BTech in Mechanical Engineering and a veteran in the Home Appliance industry with over 17 years of experience in designing appliances for industry leaders like GE and Whirlpool. He also runs a successful niche blog (RiansClub) on Mechanical Engineering