I could post a mini saas that I made in php and mysql, using jQuery on the front end, that outperforms just about any webapp and most modern local apps, but I don't want to attract too much attention because I'm sure technically it's easily breakable to pros and malicious people.

Also, it runs on a $4 a month namecheap server.

Why is so fast? Because I came from the land of slow crms, and performance was my #1 goal. Instead of making it faster to develope, I made it faster for the end user.

Is that a worthwhile business goal? I don't know. But I know it's fast.