How to change Googlebot’s crawl rate
To change the speed at which Googlebot crawls your website, you should first register at:
Once you create your account, select your website, click on the gear icon in the upper right section of the page and select Site Settings -> Crawl Rate -> Limit Google's maximum crawl rate. There you will see a slider through which you can set the crawl rate.
To reduce Googlebot's crawl speed, move the slider left (Low). To increase the crawl speed, move it right (High).
More on the Googlebot's crawl rate can be found in their official page.
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