CF worker: KV puts slow -- 400ms

So I have a CF worker that's supposed to filter requests based on their properties and track some state across requests. At the end of the request I want to update the linked state.

  async updateState() {
    return this.getState().then((state) => this.env("KV_NAMESPACE").put(this.getCacheKey(), JSON.stringify(state), { expirationTtl: TOKEN_TTL_SEC }));
  }

  async updateState() {
    return this.getState().then((state) => this.env("KV_NAMESPACE").put(this.getCacheKey(), JSON.stringify(state), { expirationTtl: TOKEN_TTL_SEC }));
  }

  async updateState() {
    return this.getState().then((state) => this.env("KV_NAMESPACE").put(this.getCacheKey(), JSON.stringify(state), { expirationTtl: TOKEN_TTL_SEC }));
  }

  async updateState() {
    return this.getState().then((state) => this.env("KV_NAMESPACE").put(this.getCacheKey(), JSON.stringify(state), { expirationTtl: TOKEN_TTL_SEC }));
  }

However, this update costs me up to 400ms, sometimes even more.
Saved payload is ~1KB and the key is ~500B

Is that expected?
Is there any way to run this update async, i.e. after returning my response to the browser?

Walshy•3/26/25, 3:24 PM

you can move it into a waitUntil - https://developers.cloudflare.com/workers/runtime-apis/context/#waituntil

Cloudflare Docs

Context (ctx) · Cloudflare Workers docs

The Context API in Cloudflare Workers, including waitUntil and passThroughOnException.

.netikrasOP•3/27/25, 8:12 AM

that's a good idea. Thank you!!

CF worker: KV puts slow -- 400ms

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