Rocket Page Speed Optimizer

Kinda works, but its highly inflexible (breaks other apps with no way of whitelisting them), the implementation is very weird, it updates your theme daily (or more) to change an expiry date. If this date is reached it wont work anymore, as a way to break it when you uninstall it. Generally this works completely without a server, so a one-time payment would make more sense. Instead they have a monthly fee for doing basically nothing after installing, other than messing with your theme. Customer service also never answered my question for a way to whitelist scripts. Better use another app, that ain't it.

I have been using this for 5 months. The concept is great, but the implementation of this is trickier than meets the eye. There are plenty of issues with the implementation and support side. It appears to work, but after a while more and more issues parts of the website/theme will break. This is only caused issues with breaking my theme in various areas that takes a long time to find out. I have been in contact with the support team multiple times, and after it repeatedly breaks the website, they stopped responding to emails. I have been left without support from the team and will no longer use this.

We installed the app and were in contact with a member of their team. He noticed that we were using other plug-ins and proceeded with manual customization. Apparently, no testing was conducted after making these changes. As a result, our entire front page became non-functional, and product images failed to load. This issue cost us a full day of revenue. Completely unacceptable.

I've been using Page Speed Optimizer since August 2024, so for about 6 months. I use Dawn theme and update regularly. This app works as advertised - pushing my Page Speed Insight performance score up from the 40s and 50s to the 90s across my Shopify site (blog, pages, products, homepage...). Page speed is super important for SEO and this app has positively impacted this aspect of my SEO work. The best part of the app is the customer support. Over the months I've had issues with other apps bringing my performance score down. I email Kirkland and within hours they've tweaked my implementation and solved the issues. Fast, friendly support. App works better than expected. 5 stars - definitely recommend.

Amazing App, the only one that significantly reduced the LCP of my Website. The customer support is very fast and reliable. Definitely recommend!

It works really well at first, but with time, the speed starts dropping until it is tweaked again. Then it works for a short while and then again starts dropping. The customer service is bad: they may or may not respond. Sometimes there is no response for months. After checking other reviews I see that it's a common issue. It seems like the developers don't care for their app anymore. I'm going to discontinue their service.

No customer support whatsoever. I am not sure if the app even works

I haven't seen any changes with the app installed.

Highly recommended, always an updated site-speed and a good Core Web Vital performance. Even if you make big changes on your site it will always take care of he optimizations again. Sometimes a couple of days later, but always it brings you back to an optimized and good score. Nice app, easy to use and also friendly and good support.

What is this sorcery? I've been through thousands of pounds trying to find someone to improve our site speed. We've gone from a site speed of 25 to 70. Insane! Well done team, you are incredible.

I don't know how, but this fkn thing works! Went from 23 to 60 in 3 days. Super easy to install, 0 hustle. I wish I could find this app earlier. Good job, guys!

Updated: I've emailed [email protected] on Aug 4 but got no reply ---------------------- The app is not working and the team doesn't reply to my email! I tested website speed after enabling but the result still doesn't past the Google pagespeed test

I was sceptical about this app. I thought it is bs. My website speed almost doubled (according to Shopify speed score) within few days. How about that?

Just wanted to give you an update on the work you did. Last week, we were F – worse than our worst major competitor. And now we are A. We had an LCP of over 7 seconds and now we are down to half a second. The results you have had on our site are nothing short of incredible. I don’t know how you do it and I suspect you won't tell

The app boosted the score, but Shopify has not scored us in over 6 days. The score is blank. When running the Google Speedtest, a lot of the time we get an LPC error code and Google spits us a ? mark for the score. Support has not provided a resolution and takes a time long to reply.

Just want to see a big thank you to support and Sam. I am now 72 on speed score ( was 18 ) and 99% good URL'S ( was 23% ) on Google search console. Your app is amazing, keep doing what your doing. A Very Happy Customer

Yes, it boosts your speed but it damages your code. Lost of my rich schema results. Uninstalled the app and it is fine again. Dangerous app!

Great app but changed my theme, I'm sorry I lost my temper, I became frantic and upset but this was wrong of me as I know it could have been sorted out in the end. (Please give forgive me) The code changed part of my theme through another app that was installed and shopify managed to rectify the problem. I wish you all the best with the future. All apologies once again. Kind regards, Tom.

Honestly don’t understand the metrics, but my mobile speed insights rose from 37-68 and the desktop rose from 74-90 for my main page. And 26-60 + 79-98 for a secondary page I’m focusing on.

Since inception, we had a speed score ranging between 17 - 20, day after day, month after month, even after minimizing images, etc. It never went above 20. Within less than 24 hours of installing Core Web Vitals Booster the score went to 27, and the following day it went to 35. Very Happy with this App!