Based on their examples: * Consistent UI performance under load. Not the same as "goes faster", just "doesn't slow down". * More efficient resource/CPU utiliz

Based on their examples: * Consistent UI performance under load. Not the same as "goes faster", just "doesn't slow down". * More efficient resource/CPU utilization. * Smarter loading of resources (kind of a sub point of 1) I think they're trying to say it's "consistently not-slow and efficient with resources". Does "fast" express that well? To grandma, sure. To a technical audience, no. https://dictionary.cambridge.org/us/dictionary/english/performant https://dictionary.cambridge.org/us/dictionary/english/perfo...