Skip to main content

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, when We-Amp brought PageSpeed optimization to the Windows/IIS ecosystem, in the same period in which We-Amp contributed to ngx_pagespeed. 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's IIS integration is now maintained in mod_pagespeed 2.1, which includes a native IIS port built on the same PageSpeed Automatic library. Existing IISpeed licenses transfer to mod_pagespeed 2.1 at no cost: transfer your license with the order number or the email address the license was bought under.

IISpeed itself no longer receives updates: no new features, bug fixes or security patches. Existing installations keep working, there is no hard cutoff date, and we still answer questions about IISpeed. Fixes, including security fixes, go into the mod_pagespeed IIS module and reach IIS users through its published installers; the current one is 2.5.0. 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.AspNetCore ASP.NET Core middleware. See we-amp.com/open-source for a longer note on how the open-source heritage relates to today's products.