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YSlow.js is installed in the code base by default, however, on installation an install script is run to ensure that the pathing is setup correctly. This install script does not support Windows.

Pathing to yslow.js is in the Mac / Linux format. As a workaround you should be able to simply add the following when initializing YSlow.

YSlow.js isntallation isn't supported on Windows. See for Windows installation instructions.

var YSlow = require('yslowjs');
YSlow.prototype.script = '/path/to/yslow.js';

If this doesn't work, the failover is to isntall yslow.js ( and specify the path as shown above.