Does Lazy Loading Affect SEO?

Yes. Mostly for the better, too.

The standard advice is sound. Use the attribute built into the browser rather than a script. Leave the top of the page alone, since the first picture somebody sees should never wait. Then keep your main content out of it entirely.

All of that gets covered properly elsewhere on this site. The image half belongs with image optimization. Rendering belongs with the JavaScript pages. A slow website has its own answer as well. So none of it gets repeated here.

This page is about something narrower. What kind of change lazy loading actually makes to a page.

Compression Makes a File Smaller. Lazy Loading Makes One Optional.

Line up the things people do for speed.

Compress an image and the file is smaller. Permanently. For everybody, whoever asks for it. Put your files on a network closer to your reader. Then the trip gets shorter, an argument made on its own page here.

Now set lazy loading beside those two. It does neither.

The image is the same image. Same size. The same server, and the same seconds to arrive once anybody asks. Nothing about the file changed at all.

What changed is whether the request happens.

So it is a different kind of move. Compression alters the thing itself. Meanwhile lazy loading alters the terms.

The Condition Lazy Loading Runs On

Part of your page now arrives on a condition. Which makes the condition worth a look.

It is a behaviour. Somebody has to scroll. Or come near enough to the picture that the browser decides to go and fetch it.

Nothing about that is exotic. A reader satisfies the condition without thinking, since reading a long page and scrolling down one are the same act.

Only notice who the condition was written for. A person. Somebody moving down a page because they want the next part of it.

Whatever else visits your website has no such reason. Some of it scrolls anyway, since somebody built it to. Only that was somebody else’s decision.

So Lazy Loading Hands Somebody Else the Decision

Here is where it lands.

You moved part of your page behind a condition. Then you do not decide who meets it.

A browser meets it, since browsers are where the technique runs. Whatever a search engine does with your page, though, it does on its own terms. So does anything else arriving with no person behind it.

None of that is a complaint. Rather it is the arrangement you agreed to, mostly without noticing.

The top of your page is a fact about your website. Meanwhile the bottom of it is a request, made to software somebody else wrote.

Somebody Will Point at the Native Attribute

Fair, and it is the right advice. The attribute built into the browser is safer than a script somebody wrote by hand. Nearly every guide says so.

Only look at where that safety comes from. Not from anything on your website.

It comes from the thing being a standard. Other software agreed to understand it. You typed one word into a tag, and everything protecting you afterwards happened somewhere else.

Which is the same arrangement, read from the comfortable end. The reason to prefer the standard version is that more of the world agreed to honour it.

Somebody Will Say Google Renders Pages Now

It does. Rendering is real, and pretending otherwise would be years out of date.

Only rendering is not reading. Something rendering your page still decides for itself how far to go, then what to trigger on the way down.

Whether a particular crawler satisfies a particular condition is a question about one company, in one year. Nobody outside it can settle that. So the answer moves.

What does not move is the shape. Something on your page is sitting there, waiting to be asked for.

Nobody at Your Company Drew That Line

Here is the part worth an afternoon.

Lazy loading splits your page in two. There is the half arriving whatever happens. Then there is the half arriving on request.

Now ask who decided which content went where. Rarely a person.

A theme shipped with it switched on. Or a plugin applied it to every image at once. Somewhere else a developer put the attribute into a template, correctly, months before anybody wrote the page you worry about.

So the line got drawn by a default. Then it moves again by device. A phone holds far less above the line than a desktop does. The same paragraph sits above the line for one visitor and below it for the next.

Your best sentence may be on the safe side of that. It may not. Nobody checked.

What Lazy Loading Gets Right

None of this argues against the technique, and the reason it became a default is a good one.

A reader gets the top of your page sooner. Then they never pay for the pictures further down that they were never going to reach. On a long page that is a real gift. The reader is the one receiving it.

Nothing here says switch it off. Most websites should leave the thing exactly where it is.

Where the Lazy Loading Argument Stops

Images are the well-trodden case. Mostly they are fine. Search engines have handled lazy-loaded pictures for years, and the guidance for doing it properly is short.

The argument bites somewhere narrower. It bites wherever the thing waiting on a condition is words. Or a link. Perhaps the section of the page carrying your actual answer.

Nothing here is a claim about rankings, either. Nor about traffic. Nobody outside a search company can tell you what any of this is worth, so this page will not pretend otherwise.

Read Your Own Page With the Rendering Off

You can settle your own case without buying anything.

Open the page you most want found. Then view the source rather than the rendered version, which browsers will do for you. Now go hunting for the sentence you most want a stranger to read.

Should it be sitting there in the source, you have your answer. A good one, since nothing about your page depends on anybody scrolling.

Should you come back empty, you have found something worth knowing. That sentence is waiting to be asked for.

No statistic about other people’s websites settles which of those you are looking at. Yours is one keyboard shortcut away.

Site Speed Work at To-The-TOP! in Calgary

A slow website turns up often enough at SEO Company To-The-TOP!, often with a speed report attached. Often the report is right. Just as often the fix sits somewhere nobody was looking.

That is what a website audit is for. It reads the page a machine receives rather than the page you see. Businesses across Calgary get the same first hour. It often goes on finding what is there.

To-The-TOP! has been doing search engine optimization here since 2007. No guarantees. Rankings move over three to six months, and the work behind them is patient. The portfolio shows the keywords this work has reached. Where the timeline will not stretch that far, a Google Ads campaign buys attention while the slower half builds. All of it starts with keyword research.

Common Questions About Lazy Loading and SEO

Is lazy loading bad for SEO?

No. Done the ordinary way it helps, since a reader gets the top of your page sooner. Trouble mostly starts wherever the thing waiting on a condition is content rather than a picture.

Should I lazy load images above the fold?

No. The first picture somebody sees is the one you want arriving immediately. Guides agree on that, and so does this one.

Does lazy loading text hurt SEO?

It can. Words waiting on a scroll are words something may never ask for. Pictures are the well-handled case, and text is not the same question.

Is the native loading attribute better than a script?

Generally, yes. A standard other software agreed to understand beats one somebody wrote by hand. That is the whole of its advantage.

Will turning lazy loading off improve my rankings?

Unlikely, and it may cost you speed. Find out what is sitting below the line first. Then decide.