Do you have a caching service in front maybe?
Yep. Cloudflare is out front, so the actual load on the rasp-pi is mitigated by their content-delivery network.
Then, too, my website is almost entirely simple html with compressed images, so there's not a lot of bytes to shovel.
Here in Berkeley/Oakland, Sonic.net has strung quality fiber-optic, so there's 1Gbit to my house. That lets me keep up with things. However, they only give a dynamic ip address;, so my pi must keep track of its address and tell Cloudflare whenever it changes.
Works surprisingly well - from /top/ I see about several dozen simultaneous users (thank you!), and the cpu temp is about 2 degrees above its normal of 50C
The raspberry pi itself is in the crawlspace under my home, fed through a Ubiquity edge router. Much fun, playing with Unix (oops, I mean Linux) -- sends me back to days of yore when everything happened from your command lines.
The blogs that go down here typically back every request by MySQL (ahem, WordPress) which is totally unnecessary and often actively harmful since MySQL has very low default total connections allowed.
The point being: don't serve requests backed by a database unless the results are likely to change very dynamically!