How to Check Whether/Not Compression is Enabled?
For this, do the following:
Navigate to the ‘Compression’ extension menu on the IIS manager. For instance, if you want to know whether/not compression is enabled for the Default Web Site on IIS, click on the Default Web Site node in the tree structure in the left panel of the IIS manager (see Figure 1), and then select the Compression option from the right panel.
Then, when Figure 2 appears, check whether the Enable static content compression check box and/or the Enable dynamic content compression check box is selected; if so, it means that Compression has been enabled.