Because it suggests the application was built with performance in mind (optimal rendering, rendering techniques, optimal data retrieval/caching, just generally

Because it suggests the application was built with performance in mind (optimal rendering, rendering techniques, optimal data retrieval/caching, just generally not a cookie cutter implementation). I would look for those terms as signals for things that must have performance like data tables, animation frameworks, real time apis (anything real time), and things that dictate your data rendering (state management libraries like redux). These things cannot be slow, so please indicate that you did not make it slow by saying “blazing-fast”!