Some hard numbers [1] as to why GitHub is struggling with stability issues, directly from GitHub's COO:

Yup, platform activity is surging. There were 1 billion commits in 2025. Now, it's 275 million per week, on pace for 14 billion this year if growth remains linear (spoiler: it won't.)

GitHub Actions has grown from 500M minutes/week in 2023 to 1B minutes/week in 2025, and now 2.1B minutes so far this week.

So we're pushing incredibly hard on more CPUs, scaling services, and strengthening GitHub’s core features.

1: https://x.com/kdaigle/status/2040164759836778878

AI. GitHub usage has exploded recently due to the ease at which code can be generated.

From what I remember, it got much worse the moment they started requiring JS for displaying what would otherwise be mostly static (and thus easily cached) content.