Module
Basic Scalability, Caching, and Performance
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About
Vertical vs horizontal scaling, stateless app servers, load balancers, reverse-proxy caching, CDN static assets, HTTP caching headers (Cache-Control, ETag, Last-Modified), database connection pooling and simple indexing awareness, rate limiting, and identifying bottlenecks (CPU, I/O, DB, network).
Goal
Instrument the app with basic metrics; apply caching headers and a simple reverse-proxy or in-memory cache; explain how to scale the app tier horizontally while keeping sessions/auth correct (sticky sessions vs shared store vs pure JWT); list the top 3 likely bottlenecks and mitigations for a given workload.
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