their Mod_Pagespeed service mod_pagespeed is an open source Apache module, not a service. Google also runs PageSpeed Service, an optimizing proxy. Both suppo

their Mod_Pagespeed service mod_pagespeed is an open source Apache module, not a service. Google also runs PageSpeed Service, an optimizing proxy. Both support automatic conversion to progressive jpeg. SPDY does as well, translating jpegs that are over 10K to progressive by default The author has SPDY and mod_pagespeed confused; this is a mod_pagespeed feature. (I work at Google on ngx_pagespeed.)