revise May 2026 systems performance articles

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 960 540" role="img" aria-labelledby="title desc"><title id="title">Synthetic critical-path waterfall</title><desc id="desc">Одна synthetic trace: очередь 520 единиц, БД 150, внешний вызов 200 внутри end-to-end границы 1000.</desc><rect width="960" height="540" fill="#0c1220"/><text x="56" y="62" fill="#f8fafc" font-family="system-ui" font-size="28" font-weight="700">fixed-trace-01: critical path</text><text x="56" y="96" fill="#a8b7d1" font-family="system-ui" font-size="18">условные единицы; наблюдение, не latency claim</text><line x1="220" y1="140" x2="860" y2="140" stroke="#64748b"/><g fill="#a8b7d1" font-family="system-ui" font-size="15"><text x="220" y="128">0</text><text x="520" y="128">500</text><text x="830" y="128">1 000</text></g><g font-family="system-ui" font-size="19"><text x="56" y="210" fill="#dbeafe">admission queue</text><rect x="246" y="176" width="333" height="48" rx="8" fill="#f59e0b"/><text x="390" y="208" fill="#1f2937">520 wait</text><text x="56" y="300" fill="#dbeafe">database execution</text><rect x="585" y="266" width="96" height="48" rx="8" fill="#38bdf8"/><text x="602" y="298" fill="#082f49">150</text><text x="56" y="390" fill="#dbeafe">external dependency</text><rect x="687" y="356" width="128" height="48" rx="8" fill="#a78bfa"/><text x="725" y="388" fill="#2e1065">200</text></g><rect x="220" y="452" width="640" height="35" rx="8" fill="#1e293b"/><text x="410" y="476" fill="#e2e8f0" font-family="system-ui" font-size="17">root boundary: 1 000 units</text></svg>