How does Kotlin support high-throughput API design under load?

Kotlin achieves high throughput using coroutines, non-blocking IO, and minimal thread blocking.

High-throughput APIs rely on non-blocking execution. Kotlin coroutines allow request handlers to suspend during IO instead of blocking threads. This enables a small thread pool to handle massive concurrent requests. Combined with connection pooling, caching, and efficient serialization (kotlinx.serialization), throughput increases significantly without scaling threads linearly.