All 18 Memory & Garbage Collection questions
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What is a memory leak in a garbage-collected language like C#, given that the GC handles cleanup automatically? What is boxing and unboxing, and why does it have a real performance cost? What is the difference between Dispose and Finalize in C#, and when should each actually be used? What causes managed memory leaks despite the GC? How does the difference between the Server GC and Workstation GC modes affect a .NET application's throughput and latency characteristics? How would you use a memory profiler (or dotnet-counters / dotnet-gcdump) to diagnose excessive garbage collection pressure in a production .NET application? What is the Large Object Heap (LOH), and why do objects allocated there behave differently from regular small objects? How do WeakReference<T> objects work, and in what scenario would you use one instead of a normal strong reference? How would you use ArrayPool<T> to reduce garbage collection pressure in a high-throughput, buffer-allocating hot path?
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C# › Memory & Garbage Collection

How do Span<T> and ArrayPool reduce GC pressure?

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Span<T> gives allocation-free views over existing memory (arrays, stack, native); ArrayPool<T> rents and returns buffers instead of allocating. Both cut Gen 0 churn on hot paths.
var buffer = ArrayPool<byte>.Shared.Rent(4096);
try { Read(buffer); } finally { ArrayPool<byte>.Shared.Return(buffer); }
Real-world example A high-throughput parser reuses pooled buffers to avoid allocating per request.
All 18 Memory & Garbage Collection questions