#パフォーマンス

A hybrid approach that lets Apache POI build the OOXML scaffold while sheetData is streamed by hand. Verified XML escape, control char, date cell, and merge behavior of scndry's implementation on M1 Max.

Based on Pareto's Streaming SSR article, why TTFB degrades on SSR pages waiting for multiple APIs, and what to check in DevTools and APM.