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Burstable CPU Credit Exhaustion as a Silent Mid-Run Slowdown

This is the specific mechanism behind 'the cheapest instance is often the most expensive way to finish', and because it fails silently a researcher will otherwise blame their code or their data. It makes the cost-per-result node concrete rather than abstract.

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Diagnosing CPU Disk IO Memory Query and Lock Bottlenecks in Amazon RDS

Database performance diagnosis proceeds by bottleneck classification: observed slowness is a symptom whose cause resolves into one of a small set of contended resources — CPU, memory, disk I/O, query…