Answer
Tier 0 generates fast unoptimized code for quick startup; Tier 1 recompiles hot paths with optimizations. Tiered PGO enhances long-running performance. Together they balance startup speed and runtime throughput.
Quick Answer
Tiered compilation runs code at Tier 0 (minimal optimization, fast startup) first. After a method is called N times (hot path), it's recompiled at Tier 1 with full JIT optimizations. With PGO (Profile-Guided Optimization) in .NET 6+, Tier 1 uses actual runtime profile data to make even better optimization decisions.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ