Top 50 performance optimization Interview Questions
The most frequently asked performance optimization questions across all roles and companies, ranked by real interview frequency. Updated daily.
Analyze a code path and improve its runtime and memory usage with a better algorithm or data structure.
Texas Mutual InsuranceIdentify configuration, HTTP resource, string-building, and error-handling problems in a Google Cloud quota helper.
GoogleReplace quadratic duplicate-pair counting with a frequency-map solution and explain the performance improvement.
Coalesce metric updates into render windows, keeping only the latest value for each metric.
RobinhoodTranspose a strided matrix with cache-aware tiling while tracking source cache-line transitions.
AMDCount a sorted multiway join in one pass using streaming group alignment and O(k) memory.
LyftDemonstrate data modeling and PostgreSQL performance practices by summarizing posted account activity for active accounts.
JPMorganChaseWrite and optimize a PostgreSQL transaction summary query while discussing procedures, cursors, and performance tradeoffs.
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