https://wccftech.com/343-plans-to-address-performance-issues-found-in-halo-infinites-test-flight/

The Halo Infinite test flight has come to an end recently. Unfortunately, the game had some performance issues that kept it from reaching its peak on PC. However, 343 Industries has gone on record to say that the issues have been identified and will be addressed by the time the next Test Flight begins.

Halo Infinite struggled to maintain a consistent 60 FPS during the test flight, even with the framerate set to uncapped in-game. IGN found this out while testing the game on a rig with an NVIDIA 3090 GPU, an AMD 5950x CPU, and 64 GB of RAM. Until the test flight ended, IGN discovered that the Halo Infinite Engineering team could fix some of the issues by performing system-level changes and unlocking the FPS out of the gate, which is not something you can do in-game.