Answer
Async frees threads, increases concurrency, prevents starvation, avoids deadlocks, and enables high-throughput Kestrel performance.
Quick Answer
I/O operations (database, file system, network calls) are slow — milliseconds to seconds. Synchronous I/O blocks the thread completely during that time. ASP.NET Core is designed to handle many concurrent requests with limited threads. Async I/O releases the thread to handle other requests while waiting, dramatically increasing request throughput with the same thread count.
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.
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Source: SugharaIQ