Indexation levels (the number of pages Google crawled and kept in their index) are directly correlated to improvements in speed/load time of a website’s pages.
Google allocate a certain amount of spider crawl resources to a site therefore by optimizing for speed, you can improve your odds of getting all those pages crawled and into the index.
Of course, improving load time also makes for satisified visitors and lower abandonment (bounce) rates, so that’s another good reason to opitmise your site for speed.
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