Google has introduced a new image format to help speed up the performance of websites. WebP (pronounced “weppy”) reduces the file size of images by 40 percent, the company claims. Images make up 65 percent of the bytes transmitted per Web page, according to Google. WebP was designed to improve the compression offered by the widely used lossy JPEG format. The result is the lossy WebP. It comes at a time when Google has warned the Web developer community that it has started to factor loading speed as part of its criteria in ranking sites in search results.