Stripe is a good example, thanks. I absolutely agree that in a good web app DB is a bottleneck and can be 10 times slower than any part of the web app itself,

Stripe is a good example, thanks. I absolutely agree that in a good web app DB is a bottleneck and can be 10 times slower than any part of the web app itself, regardless of the language. Maybe Ruby ORMs are not so optimized, who knows.