In the first article, we got started with Jeffrey Microscope and learned to read a single flamegraph — the timeseries, search, tooltips, and the allocation and wall-clock variants. This time we build directly on that foundation and tackle one of Jeffrey's most powerful features for real-world performance work: the differential flamegraph, which compares two recordings and shows you precisely what changed between them.A single flamegraph tells you where your application spends its time. But the questions that matter most in practice are comparative: