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About

IISpeed is a native C++ module that ports PageSpeed Automatic optimization to Microsoft IIS. It automatically optimizes website output for bandwidth and latency, improving user experience and Core Web Vitals compliance.

The project started in 2012, announced on the Google Developers Blog in 2013, when We-Amp brought PageSpeed optimization to the Windows/IIS ecosystem. IISpeed was built on top of the same PageSpeed Automatic libraries used by mod_pagespeed (Apache) and ngx_pagespeed (nginx).

Supported technologies

IISpeed works with any technology running on Microsoft IIS, including:

  • ASP.NET and ASP.NET MVC
  • Classic ASP
  • PHP on Windows
  • ColdFusion
  • Plesk on Windows
  • SharePoint

IISpeed and mod_pagespeed 2.1

IISpeed is now maintained as part of mod_pagespeed 2.1, which includes a native IIS port built on the same PageSpeed Automatic library. The IIS package ships from the 1.15 packaging channel. Existing IISpeed licenses transfer to mod_pagespeed 2.1 at no cost — email info@we-amp.com with your license key.

New features, bug fixes, and security patches land in mod_pagespeed 2.1. Full details and FAQ.

Company

IISpeed is developed by We-Amp B.V., a Dutch software company specializing in web performance infrastructure.

We-Amp continues to maintain the underlying PageSpeed optimization technology that powered IISpeed — now as mod_pagespeed 2.1 (IIS, Apache, nginx) and as the WeAmp.PageSpeed ASP.NET Core middleware. See we-amp.com/open-source for a longer note on how the open-source heritage relates to the commercial products.