.NET 10 reached general availability in November 2025 and has now been battle-tested for six months. The release focuses on smaller native executables, faster startup, and incremental improvements to the JIT rather than sweeping API changes.

C# 13, shipped with the same SDK, adds targeted language features that reduce boilerplate without introducing breaking changes. Teams running ASP.NET Core and EF Core workloads can adopt these updates with minimal migration effort.

#Runtime and AOT Improvements

The Native AOT toolchain now produces binaries 15-25 % smaller on x64 Windows compared with .NET 9. Cold-start latency in minimal APIs dropped by roughly 30 ms on average in internal benchmarks.

  • Improved crossgen2 profile-guided optimization for ASP.NET Core apps
  • Reduced memory footprint for trimmed console utilities

#C# 13 Language Changes

Primary constructors on classes and records can now include validation logic. Collection expressions gained support for spread operators on custom types that implement IEnumerable.

csharp 
public class Order(int id, string sku)
{
    public int Id { get; } = id > 0 ? id : throw new ArgumentException();
    public string Sku { get; } = sku;
}

#ASP.NET Core and EF Core Updates

Minimal API endpoint filters now support async result interception. EF Core 10 adds native support for JSON columns in SQL Server 2022+ without custom value converters.

csharp 
app.MapGet("/orders/{id}", async (int id, OrderContext db) =>
    await db.Orders.FindAsync(id))
    .AddEndpointFilter<ValidationFilter>();

#Practical Adoption Steps

  • Update global.json to SDK 10.0.100
  • Enable PublishAot in project files for new services
  • Migrate EF Core queries to use new JSON column mapping

Test the new AOT builds on a staging Windows Server instance before promoting to production. Measure startup time and memory usage against your current .NET 9 baseline to quantify the gains.