I have high physical stress levels during interviews but it does not interfere with performance. I feel at ease and perform well under pressure because my mind feels clear and it is easy to focus and recall similar problems. I used to be a very competitive chess player and found that I could easily focus for 4-6 hours during a tense chess game.
But the high levels of arousal does show up in other ways. Higher heart rate, extra sweating, suppressed hunger, difficulty sleeping that night unless I find a way to destress. It's not something that my mind and body can sustain for weeks at a time. It's important to remember to take care of yourself and choose the stressful moments that matter.