How to download and setup pwmetrics
Open terminal and run command
                                            git clone https://github.com/paulirish/pwmetrics.git
                                        
                                        git clone is used to create a copy or clone of pwmetrics repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with pwmetrics https://github.com/paulirish/pwmetrics/archive/master.zip
Or simply clone pwmetrics with SSH
                                            [email protected]:paulirish/pwmetrics.git                                    
                                    If you have some problems with pwmetrics
You may open issue on pwmetrics support forum (system) here: https://github.com/paulirish/pwmetrics/issuesSimilar to pwmetrics repositories
Here you may see pwmetrics alternatives and analogs
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