What is the technology this website uses to display data

[AEProgram]

I like the new dropcatch, loads so fast when you do searches and sorting

https://www.dropcatch.com/auctions

What is this type of technology called? Meaning is it a framework they used? Years ago I saw a framework called codeigniter, im asking is this some type of framework that works well when you have so much data that needs to be searchable?