GZIP compression is bundling (zipping) pages on a web server before the page is sent to the visitor. This saves bandwidth and therefore increases the loading speed of the page significantly. The visitors’ web browser then automatically unzips the pages. This compressing and unzipping only takes a fraction of a second. This plugin checks if your WordPress site has GZIP compression enabled. Every time you run this check, your domain name will be sent to http://checkgzipcompression.com. We won’t sent any other private information.