My "prompt caching" change made the bill go up — here's what I got wrong
I turned on prompt caching for an agent I run all day, watched the next invoice, and the number went up . Not by a rounding error — meaningfully up. T…
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Beyond TTL: Explicit Cache Invalidation
Most engineers default to TTL for cache invalidation. But a simple Time-To-Live guarantees stale reads for a duration, which is unacceptable for criti…
HTTP Caching for APIs: Cache-Control, max-age, and stale-while-revalidate
Most API teams reach for a Redis cache or a CDN long before they've spent the one HTTP header that does the job for free. Cache-Control lets clients, …
The Fastest Query Is the One You Never Run: The Four Layers of Rails Caching
Rails Performance: Lessons from Production — #4 The first three posts were about making queries cheaper — fewer N+1s, indexes, not dragging data back …
Cloud TTS Chirp3-HD with Caching: Fixing Voice Readout for Accessibility
Cloud TTS Chirp3-HD with Caching: Fixing Voice Readout for Accessibility As a solo developer, keeping the product lean and accessible is paramount. A …
The X-Inertia cache trap: Cloudflare, Vary, and edge-cached HTML
I clicked the logo on one of my Laravel + Inertia sites and the homepage rendered inside Inertia's error modal — in production, on a 200 response. The…
Want to Go Deeper?
Your LLM bill is exploding because 70% of user queries are semantically identical, yet your traditional cache ignores them completely. Even worse, if …
Caching Layers in 2026: CDN, App, DB, Query: What Goes Where
Book: System Design Pocket Guide: Fundamentals — Core Building Blocks for Scalable Systems Also by me: Thinking in Go (2-book series) — Complete Guide…
Web performance beyond Core Web Vitals
Originally published at thatdevpro.com . Part of ThatDevPro's open SEO + AI framework library. ThatDevPro is an SDVOSB-certified veteran-owned web + A…
Service Worker Caching Strategies: Cache-First, Network-First, and SWR
Related: Network Optimization for SPAs and React Apps covers the broader network optimization picture including HTTP caching and API request optimizat…
Your "Cache Invalidation is Hard" Answer Misses the Real Horror
Your "Cache Invalidation is Hard" Answer Misses the Real Horror Most engineers parrot "cache invalidation is hard" as a standard interview response, b…
Best practices for CDN caching and origin caching optimization
CDN and origin caching optimization: 12 strategies that actually work If you're watching your server costs climb while page load times disappoint user…
Making It Fast: Caching, Hot Paths, and Avoiding DB Calls
The Auth Gateway sits in front of every authenticated request in the platform. Its latency isn't just its own latency — it's the floor for every servi…