Sub-100ms file open: how we rebuilt the storage layer
A walkthrough of the edge cache, content-addressed storage, and zero-copy stream that brought open latency under 100ms p95.
Performance dashboard showing sub-100ms p95
Where the latency was going
The first profiler trace was painful: 60% of an open call was spent in metadata round-trips, not the actual byte transfer.
The latency breakdown made the next steps obvious.
The fix in three layers
- Edge cache for hot metadata (Redis at the PoP)
- Content-addressed blobs so cache hits skip the central DB
- Zero-copy stream from cache to client socket
Together these moved p95 open latency from 320ms to 78ms across our top 5 regions.
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