Each booking likely represents dozens to hundreds of requests. Then, for every visit resulting in a booking there’s probably hundreds of non-booking visits.
I don't doubt that they don't prcess a lot of money - that's besides the point.
They're a cookie cutter CRUD app (that happens to process a lot of money) that takes _hundreds_ of requests and 12 seconds to load on a 32 core workstation with a gigabit fibre internet connection. They have no business writing a blog on performance engineering.