Your dev tool is faster/more scalable/more X -> show it with benchmarks.
For some tools the entire unique selling point is that they are faster.
You build your messaging around that, put a flavor of "fastest Y for X" in the header and call it a day.
But devs who come to your website cannot just take your word for it. They need to see it, test it.
For some tools it is possible to just see it for themselves, get started.
But you cannot expect devs to really take a database or an observability platform for a spin.
As to test the speed or scalability on realistic use case you need to...
... set up a realistic use case. Which takes a lot of time.
But you can set that use case and test it for them. With benchmarks.
I really like how Astro approached it:
If your usp is that you are faster/more scalable/ more whatever. Back it up. This is the nr 1 thing devs on your website need to trust you with to move forward.