how to optimize wordpress website speed without plugin

Hello! I have a collegue that has a very fast site. I think he is fooling google somehow bnecause he gets 97 on mobile and it's like his website is empty. When testing it...

I have an e-commerce site and I have a speed problem on this website that has been going on for 75 days, how can I fix it. I have done all the speed optimizations and I w...

When i'm checking my website speed on Gtmetrix it is showing (let's suppose) 2s, and when i'm checking my website on pagespeed.web.dev it is showing different result. Whi...

how can I increase my website speed. and also my website is stuck on the second page how can rank my website on the first page? please guys give me a solution if anyone k...