Quill vs spdlog: Which C++ Logger Is Better for Low-Latency Applications?

Logging has a habit of ending up in the places you care about most.

It starts as a few lines for visibility. Then those lines appear in request handling, market-data processing, matching loops, telemetry pipelines, and other code where predictable latency matters.

At that point, a log statement is no longer just observability. It is work running on the same thread you are trying to keep fast.

A line like this can look harmless:

LOG_INFO(logger, "order_id={} price={}", order_id, price);