Cutting KServe cold starts from 134s to 9s with warmctl

kbesplv · reddit · 2026-10-24

A hands-on post on optimizing KServe-hosted LLM serving: the author reduces cold start time for spinning up new replicas from 134 seconds to 9 seconds using warmctl. KServe is widely used for model inference on Kubernetes, but slow cold starts (image pulls, model weight loading) hurt autoscaling responsiveness. The post walks through the concrete optimization steps and tool usage.

>Note: warmctl is the tool behind the blog, so watch for promotional framing.

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