WEBO Site SpeedUp is described as 'WEBO Software is an innovative company focused on providing website performance solutions. Its product, WEBO Site SpeedUp, is a world leader in accelerating PHP based websites and has thousands of real installations'. There are more than 10 alternatives to WEBO Site SpeedUp, not only websites but also apps for a variety of platforms, including Google Chrome, Firefox, SaaS and iPhone. The best alternative is Google Lighthouse, which is both free and Open Source. Other great sites and apps similar to WEBO Site SpeedUp are PageSpeed Insights (Free, Open Source), GTmetrix (Freemium), WebPageTest (Free, Open Source) and DareBoost (Freemium).
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.