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Head-of-Line Blocking: How Can a Single Slow Request Slow Down an Entire System? Server Affinity (Sticky Sessions): When Is It Useful and When Does It Become a Problem? Cache Invalidation: Why Is It Considered the Hardest Part of Caching Systems? Noisy Neighbor Problem: Why Does a Server Slow Down Even When Your Application Isn't Using Many Resources? Graceful Degradation: How Services Continue Operating During Failures Read Replicas: How to Improve Database Performance Without Upgrading the Server Horizontal Scaling vs Vertical Scaling: Which Is Better for Expanding Server Capacity? Connection Pooling: The Secret Behind Better Database Performance Write Amplification: Why Do Some SSDs Wear Out Faster Than Expected? Split-Brain Problem: The Silent Threat in Distributed Systems