u/enescakir

We operate a fleet of self-hosted GitHub Actions runners in an EU region. Starting around 2026-05-19, multiple workflows have begun experiencing severely degraded actions/checkout performance.

Is anyone else experiencing similar issues? We haven’t been able to find any active incidents

Symptoms

git fetch against GitHub from EU runners exhibits one of three failure modes, all of which look like the same underlying throughput collapse:

• Silent stall — no output for 15–25 min, killed by timeout-minutes.
• HTTP/2 stream cancelled — RPC failed; curl 92 HTTP/2 stream X was not closed cleanly: CANCEL, fatal: early EOF.
• Extremely slow transfer — Receiving objects crawls along at 10–25 KiB/s.

Handshake (DNS, TCP, TLS) is consistently healthy; the problem is mid-transfer.