Introducing Workers KV Instant — powered by Quicksilver

Cloudflare has introduced Workers KV Instant, a private-beta mode for Workers KV powered by its internal Quicksilver v2 system, designed for small, infrequently updated configuration data that must be globally available with very low latency. Using the same Workers KV API, Instant mode delivers p99 reads of roughly 1.62 milliseconds and replicates most writes worldwide in about 250 milliseconds, compared with slower cached and uncached reads and multi-second replication in classic Workers KV. It is intended for hot-path uses such as feature flags, routing settings, and launch controls, but differs from classic KV by requiring explicit namespace creation in Instant mode, excluding metadata support, returning all matching keys without pagination, limiting namespaces to 1 MB and 10,000 key-value pairs, and allowing one write per namespace per second. Reads cost $0.20 per million operations, 60% less than classic KV, while writes, lists, and storage are substantially more expensive at $0.10 per operation and $100 per MB monthly, reflecting its focus on read-heavy, compact datasets rather than frequently updated or large-scale storage.

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