Page Speed and User Experience (UX): How to Impress Your Visitors

Looks like a great tool.

You have unnatural sounding language on your landing page.

"No need to be expert" would read better as "No need to be an expert."

"Guideline step by step" sounds weird. I am not sure exactly what you are trying to say.
"Step-by-step guidance" would sound better.

Please invest in editing and copywriting services by a native English speaker. It will cost you nothing compared to what you have obviously already spent in time and effort to build this impressive-looking system, and it will make you look 100 times more credible.

The software itself honestly looks great. The only qualm I would have is that sometimes Lighthouse warnings are best ignored, but knowing when to ignore them and when to fix them takes a lot of contextual knowledge.

My new project https://waterfaller.dev/ customizes user stories that will boost your scores.