Go 1.21 vs 1.26 on gorush: Green Tea lost this round

Fri, 31 Jul 2026 13:45:00 +0300

We recently brought a long-lived internal fork of appleboy/gorush [1] back up to date and moved its build from roughly Go 1.21.1 to Go 1.26. The upgrade was necessary. It was also a good excuse to test a claim that often slips into migration reports without evidence: “the new Go runtime made it faster.”

It did not-not with the default collector in the local hot paths I measured.

About

Mon, 01 Jan 0001 00:00:00 +0000

I am a Senior Go Developer focused on payments, distributed systems, integrations, and backend infrastructure. I prefer explicit architecture, observable services, and boring technology that is easy to operate.

Experience

Sendsay (Internet Projects) - Senior Go Developer

2025 - Present · Remote

Stack: Go, PostgreSQL, Gin, Valkey, Kubernetes, Argo CD, Prometheus, Grafana

Designed and launched APIs for a new WYSIWYG email editor, replacing a legacy workflow.
Built an LLM-assisted subject-line generation API through OpenRouter.
Set up a k3s cluster and a GitOps delivery flow with Argo CD.
Updated and adapted a long-lived internal fork of appleboy/gorush.

Zaman Bank - Senior Go Developer

2023 - 2024 · Remote

Igor writes to the internet

Go 1.21 vs 1.26 on gorush: Green Tea lost this round

About

Experience

Sendsay (Internet Projects) - Senior Go Developer

Zaman Bank - Senior Go Developer