Google’s Not Fooled By Pretend Lighthouse Scores

Google's Not Fooled By Fake Lighthouse Scores

Google’s John Mueller tells SEOs that faux Lighthouse scores gained’t assist web sites rank any greater in search outcomes.

For enterprise house owners, be weary of anybody promoting a service that guarantees to spice up your search engine marketing by tricking Lighthouse.

Mueller addressed this on Twitter after a Shopify efficiency engineer named Colin Bendell introduced consideration to the difficulty.

From the sounds of it, it’s attainable Shopify companions are promoting “search engine marketing boosters” that declare to spice up rankings by dishonest Lighthouse.

Along with not rating any greater in search outcomes, the Shopify engineer warns of penalties for promoting such a service.

“It makes me offended after I see devs deliberately promoting snake oil to entrepreneurs

Let me be clear: Any Shopify accomplice promoting “search engine marketing boosters” that cheat lighthouse scores and damage the client expertise is violating the AUP&PPP. There will likely be penalties

You’ve gotten been warned”

In a earlier tweet he exhibits an instance of how builders try to idiot Google with faux Lighthouse scores.


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This code directs the web site to acknowledge when Lighthouse is working a take a look at on it.

If the ‘userAgent’ detects ‘Chrome-Lighthouse’ then ‘doc.write()’ is triggered. This wipes the web page that simply loaded and begins writing one thing new.

In consequence, Lighthouse doesn’t get an correct studying of the web site’s rating, which is believed to have a optimistic influence on search engine marketing. Presumably as a result of it disguises dangerous scores.

I reached out to Mr. Bendell for additional perception into why using ‘doc.write()’ is a foul follow. He tells me:

“It forces the browser to halt all exercise and inject the web page with the content material. In consequence the browser can’t proceed to look forward on the web page to see if it must load different photos or javascript as a result of it might seriously change primarily based on what the doc.write() does.

… using doc.write() obfuscates its contents and is a typical method for nefarious code to be injected.

The difficulty is that the if situation (if window.navigator.userAgent !== Lighthouse) mainly omits all of the scripts and css and different litter. It makes the web page actually quick for lighthouse.”


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Though Lighthouse might imagine it’s testing a brilliant quick website, Google gained’t be swayed. Right here’s what Mueller has to say about this tactic.

Google’s John Mueller on Pretend Lighthouse Scores

Whether or not real or fabricated, Lighthouse scores usually are not utilized by Google to rank webpages.

The truth is, user-agent cloaking might result in a damaging influence on search engine marketing as a result of it prevents you from discovering the actual issues in your web site.

Mueller says:

“Lighthouse scores don’t have an effect on Google Search.

Doing this sort of user-agent cloaking is a horrible thought – you’re simply deceiving your self. It makes completely no sense, and prevents you from discovering actual points. In case you run throughout a plugin that does this, report it to the CMS.”

Lighthouse is meant for use as a developer software. The scores it generates are primarily based on lab information, which is why it has no influence on search.

When rating components comparable to web page pace and core internet vitals, Google evaluates them utilizing discipline information.

Area information is collected from actual customers, versus lab information which is produced by way of a managed take a look at.

Google prefers to make use of discipline information as a result of it’s a extra correct reflection of the person expertise.

Lighthouse scores are irrelevant to Google, however they might help with figuring out and fixing search engine marketing points.

Nevertheless, that’s solely true if the location might be examined correctly, which isn’t attainable with person agent cloaking in place.

Tricking Lighthouse Results in Worse search engine marketing

Shopify’s Bendell provides that this system might load pages quick for Lighthouse, however precise guests will expertise worse efficiency:

“… the code snippets I shared within the tweet are making issues quicker for lighthouse, however mockingly, making issues slower for actual people. And since search engine marketing is predicated on actual human efficiency (utilizing CrUX information), the irony is that the so-called pace up is making the human expertise slower and thus reducing your search engine marketing.”

Google warned developers towards using doc.write() again in 2016, explaining the damaging influence it has on web page efficiency:


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“… scripts dynamically injected by way of doc.write() can delay the show of primary web page content material for tens of seconds, or trigger pages to both fail to load or take so lengthy that the person simply offers up.”

The important thing takeaway right here is don’t try and trick Lighthouse and don’t get taken by anybody attempting to promote this to you as a service.

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Featured Picture: Romolo Tavani/Shutterstock

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