Microsoft wants you to believe .NET 10 is boring. They’re right — and that’s the best news we’ve had in years.
.NET 10 is here, and for once, Microsoft didn’t oversell it. LTS support through 2028, JIT improvements that actually matter, and C# 14 features that won’t rewrite your architecture. Here’s what you need to know before migrating.
string.Format() with the same format string, .NET parses it again. And again. And again. CompositeFormat changes that: parse once, reuse forever. The result? Up to 30% faster formatting, fewer allocations, and a one-line code change. Here’s why this matters and how to use it.While you’re busy optimizing database queries and adding cache layers, thousands of string searches per second are quietly eating your CPU budget. The problem isn’t visible in your APM dashboard because it’s distributed across every request. But it’s there. Compounding. Scaling linearly with load.
I discovered this the hard way when a log processing API started choking under production traffic. The bottleneck? String validation and sanitization. The fix? A .NET 8 feature that delivered a 5x performance improvement and let us shut down servers instead of adding them. And it’s gotten even better in .NET 9 and 10.