High Sierra was the last macOS version to officially support NVIDIA Web Drivers. If you have an older Mac Pro with a NVIDIA GeForce card, High Sierra is the "sweet spot" where you can get maximum performance and compatibility with external GPUs (eGPUs) via Thunderbolt 3, a feature that became messy in subsequent updates.
High Sierra was the last macOS version to officially support NVIDIA Web Drivers. If you have an older Mac Pro with a NVIDIA GeForce card, High Sierra is the "sweet spot" where you can get maximum performance and compatibility with external GPUs (eGPUs) via Thunderbolt 3, a feature that became messy in subsequent updates.