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"The No. 1 question we get from enterprise customers is about response time. We've now made the (test) snippet so fast that it's not perceptible," he says.
That improvement should help the 150-person start-up better compete with products made by larger rivals, such as Adobe Systems.
Optimizely's broader goal is to help companies make better use of the reams of data they collect on Web site visitors, to improve the return on their marketing investments.
Room for Improvement
Many companies don't make use of the data they have, which is why many Web sites take so long to load, Koomen says. Instead, they usually show the same text and video, news and ad content to everyone.
"The 'one-size-fits-all' Web is a technology problem that can be solved," he says.
The company's customer list has grown big enough that Optimizely is planning its first user conference, to be called Opticon, in San Francisco next April.
One key advantage it has: Businesses can test the product on their own sites without talking to an Optimizely salesperson first.
Another is something both founders learned at Google.
"We're ruthlessly focused on making sure the product works," Koomen says.
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