I would read ~100 to mean "approximately 100", while O(100) to me reads like "measured in the hundreds". So 200-600ms cold starts are O(100) and 3-7s cold start

I would read ~100 to mean "approximately 100", while O(100) to me reads like "measured in the hundreds". So 200-600ms cold starts are O(100) and 3-7s cold starts are O(1000).