Cloudflare has introduced Workers KV Instant, a new mode for its key-value store that leverages the company's internal Quicksilver technology to provide sub-two-millisecond p99 read latency. The service is designed for high-performance access to configuration data and application flags, offering faster global replication than the standard Workers KV product.
The introduction of Cloudflare Workers KV Instant provides streaming engineers with a high-speed mechanism for managing global application flags and real-time configuration changes. By exposing the Quicksilver technology previously reserved for internal use, Cloudflare is lowering the barrier for sub-millisecond data access at the edge. This shift forces a trade-off between high-volume storage and extreme read performance, as the 1MB limit necessitates precise data management. In the broader ecosystem, this move pressures other CDN providers to offer similar low-latency key-value stores for dynamic logic. Watch for the transition from private beta to general availability to see if the 1MB storage cap expands for enterprise workloads.
Cloudflare's Quicksilver v2 architecture, which powers Workers KV Instant, represents years of internal evolution. In July 2025, Cloudflare detailed how Quicksilver v2 moved from full-dataset replication to a tiered caching model with replica and proxy server roles, eliminating wasted disk space while maintaining sub-millisecond latency at the 99.9th percentile. The company introduced an interim "v1.5" design before committing to the full v2 architecture, demonstrating that proxies could match or even exceed replica performance due to smaller datasets on disk.
The scale at which Cloudflare operates Quicksilver internally provides the engineering foundation for Workers KV Instant's performance claims. Cloudflare reported that Quicksilver currently holds over five billion key-value pairs totaling 1.6 TB and serves more than three billion keys per second across 330 cities in 125 countries, with 90% of requests resolving in under one millisecond. The migration from v1 to v2 required moving hundreds of thousands of live databases without service interruption, a process the team executed iteratively over several years.
Workers KV Instant's pricing model reflects the trade-offs inherent in Quicksilver's architecture. Cloudflare charges $0.20 per million reads for KV Instant compared to $0.50 per million for classic Workers KV, but storage costs $100 per MB per month versus $0.50 per GB for the classic tier. The one-megabyte namespace cap and one-write-per-second rate limit position KV Instant squarely at configuration and feature-flag workloads rather than general-purpose storage, mirroring the exact use case Cloudflare built Quicksilver to serve internally since 2020. For developers looking to integrate these capabilities into broader infrastructure, recent Cloudflare Sandbox SDK update provides additional tools for managing data streams at the edge.
Cloudflare has launched Workers KV Instant in private beta, utilizing its internal Quicksilver technology to deliver p99 read latencies under two milliseconds. This high-performance storage mode is designed for application configuration and feature flags, offering developers a faster, cost-effective alternative to standard Workers KV for managing dynamic logic at the edge.
Workers KV Instant provides sub-two-millisecond global read latency, which is 100 times faster than the classic Workers KV mode.
Storage is restricted to a 1MB total namespace size with a maximum of 10,000 key-value pairs.
Read operations cost $0.20 per million, a 60% reduction compared to the $0.50 per million charged for standard Workers KV.
To maintain global consistency, write frequency is limited to one operation per second per namespace.
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