A widespread scam has been identified where developers falsely optimize Shopify store speeds by inserting code that detects speed testing tools (Lighthouse, GTmetrix) and serves them empty pages, artificially inflating scores. The issue became apparent when Shopify stopped using Lighthouse for its speed calculations around August 2021.
How the scam works:
Fraudulent code uses document.write and document.open commands in theme.liquid files
Detects user agents for Chrome-Lighthouse, GTmetrix, and Linux platforms
Serves blank content to testing tools while showing full content to regular visitors
Results in high test scores but poor actual performance
Detection methods:
Search theme files for document.write / document.open (use Ctrl+G)
Check if PageSpeed Insights preview shows missing elements
Use Shopify Theme File Search Chrome extension for comprehensive scanning
Look for hexadecimal encoded strings (e.g., \x6E\x61\x76\x69\x67\x61\x74\x6F\x72)
Reported scammers:
Multiple users identified fraudulent developers on Fiverr and Shopify Expert Marketplace, with screenshots shared. Several victims reported the scam takes weeks and significant money to fix, as it damages store functionality. Some confronted scammers successfully obtained refunds, while Shopify is reportedly investigating cases.
Summarized with AI on October 25.
AI used: claude-sonnet-4-5-20250929.
first of al, you should know that Shopify stopped to use Lighthouse to calculate the speed score, this is why the sudden drop of speed score in Shopify in comparison with Lighthouse or GTmetrix. Shopify does not consider the Lighthouse speed anymore. This since around the beginning of August 2021.
Now the why: some developers do ZERO/NO work on performing your store, they ONLY add a hacking code that detect speed checkers. When it detect speed checkers, it serve an empty page, with no content. Thatās why your Lighthouse or GTmetrix speed score it is so high.
Now that Shopify stop linking its speed report with such speed checkers, the scam it become clear to all. Be aware, an high amount of developers were selling fake speed optimizations, using instead this quick hack to collect money from store owners.
The code contain such lines:
document.write / document.open and are inserted in the theme.liquid (use ctrl+g to locate them). If you find such lines, you been scammed.
I suggest everyone who got this scam to reply to my post here and add the name or data of the developer to help others to do not fall in the same scam.
It is taking 2 weeks of work and lot of money to fix this issue. Cause it also damage how the store works.
Please everyone, spread the voice as much as possible because Shopify still did not made any official statement on this, and many store owners have no idea at all about this.
Letās make sure those scammers get banned and get no more money from store owners.
THANK YOU! I GOT SCAMMED AND FOUND OUT THANKS TO YOU!!!
Iāve reported it to shopify and theyāre investigating. But I found my scammer through shopify expert marketplace, not fiverr. I confronted the scammer and they gave me my money back.
This script (bot) is now commonly used in Shopify Stores to improve the admin score of Shopify and as well the score on Google Pagespeed Insights. I will suggest you and everyone to ask the developer first that how he will improve the speed of your website and then start the work with the developer in order to avoid any kind of scam. Thank you.
I have visited the profile of this seller and I can see that he has over 500+ Positive Reviews which make sense that the people are getting good results. Usually the owner of the website wants to see the results on Shopify Dashboard and on Google Pagespeed Insights. Now the developers have invented their own scripts which can improve the speed score on Google Pagespeed Insights and as well on Shopify Dashboard. These scripts do not affect the store functionality, sales or performance. In short term, these scripts improve the speed score in easy and quick way.
Youāve got to be kidding. Your store speed isnāt just a vanity metric. Itās directly correlated to conversion performance. Scamming non-technical store owners is completely unethical and borderline criminal. You said it yourself āThese scripts do not affect the store functionality, sales or performanceā WHICH IS WHAT YOUāRE BEING PAID FOR.
The script loads a blank page when it detects Lighthouse. The moved blocking script tags to deferred loading without any regard to what script is being edited. Itās nothing more than a scam and thatās it.
My favicon is not favicon.ico but since the line of code with my favicon was under the script for some reason it was not loaded and by default favicon.ico was called and returned a 404.
I found a solution to suppress that 4s lag by putting the favicon line above the script which worked.
I still have the script as if I suppress it my store doesnāt load any image but with that example we can see that the script can have an impact on the storeā¦
Adding this code destroy the shop functionality in many ways, ruin the SEO completely and also cause several tech issue internally.
This SCAM does not make the website/store faster in any way! This SCAM serve an EMPTY page to robots which means, once again, the robots DO NOT see your real store!
This man is really a big scammer. When he caught then he immediately removed malicious code and by which my speed drop from 81 to 35. He start lying in chat to manipulate even Fiverr customer support. I caught his code with the help of my developer. On queries even his behavior was unappropriated. Iām going to list his chat screenshot here.