Rare Earth Juejin Tech Community
Feb 17, 2025 · Frontend Development
Why Is There a Large Gap Between TTFB and FCP on Alibaba.com PC Homepage?
During performance tuning of Alibaba.com’s PC new‑user homepage, the Time To First Byte became acceptable while the First Contentful Paint remained 3 seconds slower, revealing that CSS download and parsing blocked rendering and that inlining critical CSS dramatically reduced FCP latency.
CSS OptimizationFCPTTFB
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