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Compression of files allows server to transmit information faster. When files are compressed to smaller size, it’s easier to deliver them to your website’s visitors. The better the compression, the faster your website uploads. Monitoring of this parameter is necessary to increase the speed of your page.
Note that internet gets faster and faster nowadays! Google ranks sites according to their page speeds. So to have a good rank you have to work on it. "Check GZIP compression" is the instrument that you need.
After enabling GZIP header for your website and verifying it, you can test your compression with this free online tool whenever you want to.
With "Check GZIP compression" testing process is much easier than it sounds! If you have doubts about whether your server compresses files before transmitting them to visitors, just start with entering your site’s address into the instrument and see the results.