Summary & Key Takeaways ​

• Attribution feedback now includes fact tables for async flights and fallbacks.
• flights tracks started, landed, and abandoned async operations with wall time.
• fallbacks measures fallback display times and sub-150ms flashes.
• New WIDE_WRITE and HOT_SCOPE_FANOUT diagnostics are added.
• Responsiveness gates like expectNoSilentHolds help identify unacknowledged holds.
• The artifact format (v2) now carries attribution.holds and attribution.feedback.

Our Commentary ​

This is a huge leap for SolidJS's diagnostic capabilities. The responsiveness gates, especially expectNoSilentHolds, are exactly what we need to catch subtle performance issues before they hit production. I love seeing frameworks invest so heavily in tools that empower developers to build truly performant applications. This is a big win for DX.