Crawlers Are Slow to Render Complex JavaScripts, Warns SEO Exec

Augusto Beato, CEO of Portland SEO, advice search engine optimization professionals to avoidusing more complex JavaScipt to boost ranking in the search engines.

"Having a complex JavaScript leaves your engine crawlers doing much of the work that wassupposed to be done by the servers," Beato pointed out. "As a result, the crawlers leave themore complex JavaScript to be rendered later."

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Traditionally, the work of crunching the code to deliver the page in full to the browser isundertaken by the server. As pages have become more complex, is increasingly done by the browser — leading to fasterweb pages. Unfortunately, it can hurt search-engine friendliness.

Since Googlebot and other search engine crawlers don’t have the resources to render anddigest every page as they crawl it, they save the more complex JavaScript to render later asresources allow.

But if a company is selling online, they need those products to be indexed as quickly as possible, to drive revenue. If their site relies on complex forms of JavaScript, rendering “might take a while.” That means that for weeks the search engines see no content or links on a company's site, pulling down their rankings.