Introducing Workers KV Instant — powered by Quicksilver

Today, we’re introducing Workers KV Instant, a new mode for Workers KV that pushes your changes globally for instant availability without cold read penalties.

Workers KV has been one of our most popular services on the Developer Platform since launching during Birthday Week in 2018. It’s great for quickly accessing data like static assets and user configuration that is written occasionally but read frequently. We use it ourselves across many Cloudflare products.

We also have another key-value store, Quicksilver, which we’ve blogged about many times since introducing it in 2020. We designed Quicksilver for incredibly fast global replication and low-latency access, and nearly every request to Cloudflare looks up at least one key in Quicksilver. People have asked us for years, but we’ve never made Quicksilver available to our customers.

We’re changing that today with Workers KV Instant. KV Instant mode provides the same API as Workers KV, but powers it using Quicksilver. KV Instant offers 100 times faster p99 reads and immediate updates, with no need to wait for a TTL to expire. It’s not for every type of data, but, for infrequently updated application configuration data — the same thing we use Quicksilver for ourselves — KV Instant shines. 

KV Instant offers read latency that is over 100 times faster than classic mode, with reads resolving in under two milliseconds even at the 99th percentile of response time (p99), and 95th percentile (p95) times measured in microseconds. Writes are pushed to the edge over 20 times faster, with 99% of all writes replicating in around 250ms.

These high-performance characteristics of KV Instant make it ideal for reading data in the hot path of your applications, especially flags and settings that should be available globally nearly instantly after they’ve been written.