6 Modern .NET API Pitfalls Hurting Performance and How to Fix Them
Introduction: Why Your .NET API Feels SluggishModern .NET APIs are incredibly powerful, yet many teams inadvertently introduce performance bottlenecks that degrade user experience and increase infrastructure costs. This guide examines six common pitfalls we've observed across numerous projects, from startups to enterprise systems. Each section follows a problem-solution format, explaining why the issue occurs, how to diagnose it, and concrete steps to fix it. By the end, you'll have a practical checklist to audit your own APIs.One recurring pattern is that developers often trust framework defaults or follow patterns that worked in older versions of .NET without adapting to modern best practices. For example, the shift from synchronous to asynchronous programming introduced subtle traps around thread pool starvation and deadlocks. Similarly, the move to JSON-based APIs exposed serialization inefficiencies that were less noticeable with XML or binary formats.Throughout this article, we'll use composite scenarios drawn from common experiences: a team