NET's HybridCache Cuts 50 Redundant DB Queries to 1 During Cache Misses

A developer discovered that .NET's commonly used IMemoryCache can trigger dozens of simultaneous database queries when multiple requests hit a cold cache simultaneously, a problem known as a cache stampede. In a controlled load test, firing 50 concurrent requests at a cold IMemoryCache endpoint resulted in 50 identical database calls, while the same test using HybridCache produced just one. HybridCache, stable since .NET 9, deduplicates concurrent requests for the same cache key, making only the first caller run the database query while the rest wait for that single result. Crucially, wall-clock response time remained nearly identical between both approaches, meaning the protection comes at no extra latency cost to end users. The real benefit is database load reduction — in production, a flood of redundant queries can compound slowdowns and trigger a worsening spiral, which HybridCache prevents.