A clear, practical breakdown of how caching works across AEM’s CDN, Dispatcher, and Publish tiers. Learn why caching is mandatory for performance and how invalidation rules determine site speed and stability.
Engineering notes and practical guides
Performance
Field notes on AEM, Java, web development, performance, tooling, and the little fixes that save future-you an afternoon.
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AEM Caching Series 1 - Cache Basics And Foundational Dispatcher InvalidationA clear, practical breakdown of how caching works across AEM’s CDN, Dispatcher, and Publish tiers. Learn why caching is mandatory for performance and how invalidation rules determine site speed and stability.
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AEM Caching Part 2 - Practical Mid-Level Strategies for Dynamic Content and Dispatcher Configuration
A tactical deep dive into mid-level AEM caching techniques—selectors, query parameters, JSON APIs, and Dispatcher rules. Learn how to stabilize cache keys, prevent cache bloat, and avoid the misconfigurations that crush performance.
A detailed architectural guide to building globally scalable AEM caching—covering multi-CDN setups, GraphQL caching, flush strategies, surge protection, segmentation, and advanced invalidation patterns. Learn how to keep Publish stable even under massive traffic.
Learn about the AEM Dispatcher in perspective of developer, why it exists, and how it works as both a caching and security layer.
A detailed walkthrough of the dispatcher.any configuration — explaining its key sections like /cache, /filter, /renders, and /farm. Learn how to read, structure, and maintain it properly.
A detailed walkthrough of the Dispatcher `/filter` Rules
A detailed walkthrough of the Dispatcher `/cache` Rules
Understand how AEM keeps cache fresh using the .stat file mechanism. Learn when and how Dispatcher marks content as stale, what /statfileslevel does, and how asset updates trigger invalidation.
Dive deeper into advanced setup — connecting Dispatcher to multiple Publish instances, handling logged-in users securely, and implementing vanity URLs using Apache rewrites.
A practical guide to fixing common Dispatcher problems — stale pages, 403/404 errors, and caching issues. Learn how to read logs, test configurations, and debug step by step.
The most common interview and practical questions around AEM Dispatcher. Perfect for refreshing concepts or preparing for real-world discussions.
Most AEM performance issues stem from inefficient query usage. This post explains when to use Query Builder vs SQL2, highlights common mistakes like missing indexes, fetching too much data, and running queries in loops, and provides practical best practices for optimized, scalable, and memory-safe queries in asset-heavy projects.