File Size: A Common Mistake That Could Be Killing Your Display Ad Effectiveness

Data-Driven Thinking” is written by members of the media community and contains fresh ideas on the digital revolution in media.

Today’s column is written by Ian Hewetson, vice president of client services at Eyereturn Marketing.

Fraud and viewability get all the attention when marketers question their display ad effectiveness. But there’s a more common issue that dilutes the reach of billions of ad impressions every day: file size. And it’s so much easier to solve than either viewability or fraud.

When Flash suddenly died, designers struggled to produce the same kinds of ads clients were accustomed to at low file size. Ad-serving platforms adjusted specs to accommodate the new reality. Where the file size of a standard ad used to be capped at 40 kilobytes, the new ad-server allowance was expanded to 300 kilobytes – a 650% increase.

And while this may seem like no big deal when we’re talking about a single ad, once there are five ads on a page, this extra file size starts to add up, especially if several of the ads are at the limit. Keep in mind that real-world download speeds are far lower than what you might expect.

Bloated file sizes also compromise viewability. As users load a page and start scrolling down, any ad that is considered to be viewable must be properly positioned and loaded to meet the standard. If the ad is taking too long to load, it’s more likely to be nonviewable.

This hurts advertisers who want to get their message in front of users. But it also hurts publishers that are trying to deliver and get paid for a high percentage of viewable ads. At least the advertiser has some control over the file sizes of their ads, but publishers running third-party tags often have no visibility into ad file sizes.

The problem becomes a perfect storm on mobile. Slower connection speeds mean longer load times. Smaller screens also mean faster scrolling. Unless the ad is anchored to the bottom of the screen, the chances of it being seen become seriously diminished.

Ads often are needlessly designed at the limit. An ad with a smaller file size is more likely to render before the user scrolls away. If a user scrolls away before seeing an ad because the designer went to the file size limit, that opportunity to connect with the consumer is lost no matter how sharp it might look.

And all too often GIFs and JPEG files are delivered at a larger file size than necessary. For the standard IAB ad dimensions, a JPEG is often going to be at its highest image quality at around 80 kilobytes. Beyond that, an ad is not going to look any prettier to the human eye.

Some large file sizes for complex or interactive HTML5 ads could be considered justifiable, of course, since these ads may need a large file size to function properly.

To be sure, there are a ton of other variables that contribute to page latency and the chance that a user won’t see an ad. These include the weight of the page, the method of delivering the ad into the page, the power of the user’s processor or browser type, to name a few. The list is almost endless, and much of it is outside of the advertiser’s control.

But given that file size is one of the few variables that advertisers do have 100% control over, they should start exercising strict oversight. And soon, LEAN standards will start to gain traction and systems like The Washington Post’s Zeus will put speed into the spotlight.

The bottom line is that everyone wants their ads to look as good as they can. But if marketers build their ads to the limit of file size rather than optimizing them for the lightest weight, it’s like approaching the finish line of a race and stopping to pick up a couple of dumbbells for the last 10 yards.

Follow Eyereturn (@EyereturnMktg) and AdExchanger (@adexchanger) on Twitter.

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