Swift SEO Page Speed Optimizer

Installed the Free Verison. After install the app slowed down my LCP on mobile by 10 seconds. Exactly the opposite what the app claims to do.

Not impressed, nor happy. Either the app or the work done by delevopers (+$175) managed to mess-up the theme, causing both design ( product titles disappeared under main menu) & usability issues ( most crucially the buy button disabled when a different variant was selected)

Since letting them know this yesterday, I can't access the app to see if they have responded to my support message ( I havent recieved an email, so doesn't seem so...)

The only thing I can do is uninstall and caution others against using this service.

I was searching that included certain features necessary to increase the speed of my store. In my experience, if an app, any app, truly solves a problem, they give you a free trial so that you can engage with the app and see how well it meets your needs. This app offered a free trial, great. The caveat is that you cannot actually utilize all of the features, no matter what package you choose, during the trial. When you visit a feature, a box pops up stating that you must click on the "waive trial" button in order to use that feature. Sketchy, for sure. But I went against my better judgement, thinking it was only $29, and waived the trial to test it. I tested all of the options, and then tested my speed on their app, where it showed menial improvement (far from what I expected). In addition, although their app shows my site speed improved, in constant testing it did not provide any noticeable increase in speed. I should also mention, despite there being no changes made to the website, and having their "daily auto boost" feature enabled, the app shows my website speed slowing down each day. They do offer, for an additional $150, to have an expert increase your speed for you, but I feel like I was scammed out of my $29 by yet another app that overpromises and under delivers and am not interested in spending even more just to be disappointed again.

I strongly advise other business owners to be extremely cautious when using Swift.

I paid for one of their higher subscription tiers for almost four years. During that time, Swift’s “optimisation” process cloned my Shopify theme templates rather than applying changes to the original theme. This was never disclosed.

I then added changes to my optimised theme, over years building my site up to it's now end stage. The result is that, because i used swift and because swift cloned my theme, the official theme updates can no longer be applied. My site is now locked into an outdated structure, and years of refinements are trapped unless I pay a developer to undo Swift’s work.

Swift has acknowledged the structure exists and is technically able to migrate the code to an updated theme, but they refuse to do so unless I pay for expert help again. I had paid for expert help years ago to make my site faster and i never saw the promised results, so expecting me to pay them again for something that is their fault is frankly an insult. Despite this, they continued charging me £30/month for years and repeatedly pushed me to pay for additional optimisation and “expert” services.

Key issues to be aware of:

Lack of transparency: You are not clearly told that optimisation may clone your theme and block future updates

Ongoing upselling: Repeated requests to pay for new optimisation and expert tickets despite already being on a high-tier subscription

Responsibility avoidance: When long-term issues emerge, they are framed as “out of scope” or your problem to fix

In my case, the service has left my site worse off than if I had never used Swift at all, and I am now paying to remediate the damage.

If you value long-term maintainability, theme updates, and clear accountability, I would think very carefully before using this service. Take it from me as a customer of years, they do not appriciate or respect your custom and i will be taking them to trading standards as misrepresentating their services.

Super bad customer support, we purchased their OneExperts speed optimisation and they are not even responding. $150 completely wasted. Stay away from these scammers

Thier app gave me serious issues, i need support to remove the code from my site. my emial is sales@toballoons.com

This app is terrible!! Do not install !!
Half our pictures are now blurry. Even after removing code pictures still look terrible. It’s unexceptionable and with offset business hours, the window of communication is very small, so this might take days to correct, meanwhile we are sitting ducks. We went in to get a faster website and ended up with a website not functioning at all

AVOID THIS APP AT ALL COSTS IT HAS CORRUPTED THE THEME ON OUR STORE!!!!
ABSOLUTELY CATASTROPHIC LOSS OF DATA DUE TO INSTALLATION OF THIS SWIFT PAGE SPEED OPTIMISER APP. From the moment our developer chose to install this app it corrupted our Theme and we have LOST SIX MONTHS WORTH OF SITE DEVELOPMENT. This is THE MOST STRESSFUL SITUATION. PLUS THEIR SUPPORT IS ABSOLUTELY USELESS AND THREE DAYS AFTER THE CATASTROPHIC CORRUPTION OF OUR SHOP THEY STILL HAVE NOT MANAGED TO RESOLVE THE ISSUES. WE ARE ANGRY BEYOND WORDS.

I would not recommend using their "experts" to boost your page speed. Paid good money and my store still has low score of 45 on Google page speed, 30 in Swift app, and 30 on shopify. Not happy that I didn't get what was expected.

The day I installed this app was the day my website went insane. I had multiple issues right out of the gate with this one. I ran the free speed optimizer and also used their image tool to optimize 100 images. My thinking was I would test the free version, and if it worked I would pay for monthly optimizations. Test failed.

The first, and biggest problem, was that the app made a duplicate version of my website. I did not realize right away, but the "optimized" theme was downgraded from Dawn 7.0 to a modified Dawn 4.0 that was unable to update. And not just the theme it duplicated....ALL my backups were suddenly Dawn 4.0. My website is less than a year old, Dawn 4.0 was never previously installed on my site, ever.

I also had multiple product images that simply vanished and needed to be re-uploaded. On mobile, my product image swipe quit working. Even though it would say 1/4 images....It would only show one on mobile. I also had two "sale" icons on the products that were on sale, and one was half way off the screen so it was definitely causing glitches. Random icons on my website also disappeared and my website was overall glitchy. The optimizer tool got my page speed from a 28 to a 41 right away. However, the next day I was down to a 21 page speed and my website was simply not working.

I decided to try to update my website to Dawn 9.0 since 4.0 was such an old version I figured that could be part of the problem...But no, the theme was modified and could not be updated. I had to download a fresh version of my theme. None of my page templates would transfer....I would have to completely re-design my website.

So I got in touch with Shopify support hoping for an easier solution, who told me whatever the optimizer did to my theme to remove the "unused" javascrips and css, did something to my theme files. They suggested I contact the app developer support and ask for whatever they did to my website to be rolled back or removed.

The Swift app developers got back to me quickly and looked into my issue, which I was happy about. However, they came back and told me it was "impossible" that my themes were downgraded to 4.0, and that it was "unreasonable" that I did not notice immediately (Do you check what version of theme you're using every day?) They offered zero solution, and told me to go back to Shopify with their email. So I did.

Shopify support agreed that the email from the Swift app support was incredibly unhelpful and basically dodging responsibility. I spent a whopping four hours with Shopify support, and spoke to multiple people as they sent my case up the ranks to figure out why my site wouldn't update, why there were so many glitches, and why none of my page templates would transfer to my fresh Dawn 9.0 theme download from the modified 4.0 themes. After all that time, it was finally suggested that I just rebuild my page themes and redesign my website. We had to delete all my old backups that were corrupted by the Swift Page Speed Optimizer tool and start over. Devastating.

After removing all of the theme backups that were corrupted and starting on a fresh theme download....My google page speed went from a 21 to a 64. Removing whatever the Swift app did, fixed everything. My website now runs flawlessly with a vastly improved speed score. In hindsight, I should have just upgraded to 9.0 before trying this app.

I asked the Shopify support rep how a Shopify app from the Shopify App Store could so severely damage my website files...and they told me that Shopify has no control over what apps are on the app store and to use caution. They told me the best thing I can do is to leave a detailed review of what happened so other users may not have this problem. So here I am .

I give one star for the support team responding to me, thanks for the response, as unhelpful as it was. Otherwise, I would avoid this app, or any app, that automatically alters theme files. Zero stars.