Quote Originally Posted by Xbox
[...] the Xbox design team developed a next-generation controller to deliver what fans wanted most: improved ergonomics for a wider range of people, better cross-device connectivity, easier sharing, and reduced latency. [...]
Xbox Series X: Making Gaming’s Best Controller Even Better - Xbox Wire

Quote Originally Posted by Xbox
[...] For Xbox Series X, the team devised a solution in which the new controller samples and transmits the most up-to-date input just before the game asks for it. The result is “just in time” delivery that they call “Dynamic Latency Input (DLI)”. The system now precisely keeps the controller in sync with the game for both analog and digital inputs. The most update-to-date input arrives at the console just before it’s needed by the game. The result: significantly lower controller latency. What’s more, it’s all done without sacrificing anything in the way of battery life. [...]
Xbox Series X: What’s the Deal with Latency? - Xbox Wire

Defining the Next Generation: An Xbox Series X Technology Glossary - Xbox Wire