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What is gzip compression?
When a user hits your website a call is made to your server to deliver the requested files.
The bigger these files are the longer it's going to take for them to get to your browser and appear on the screen.
Gzip compresses your webpages and style sheets before sending them over to the browser. This drastically reduces transfer time since the files are much smaller.
In terms of cost versus benefit, gzip compression should be near the top of your page speed optimizations if you don't have it setup already.
Our GZIP compression tester lets you verify whether your web content is being compressed or not.
If not, read our article Enable gzip Compression on the simple steps you can take to compress your web content and improve your SEO.