Handle ANR (Application Not Responding)

ANR = main thread blocked >5 sec. Play threshold: <0.47%.

What causes ANR

• Synchronous network on main thread
• Heavy computation in render
• Disk I/O on main thread
• Bridge serialization of large data (RN-specific)
• Animation conflicting with layout

Detect

Play Console → Vitals → ANRs. Lists stack traces of recent ANRs.

Sentry → Performance → "ANR" issue type.

Fix patterns