System Design - caching
#01 Latency
The 200ms Promise: How to Rescue an API That's Bleeding Latency Premium
Your PM demos the app to investors. Every API call takes 2 seconds. You have one weekend to fix it. Here's exactly where to look and what to do.
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#02 Caching
The Cache That Made Things Worse Free
You added Redis to speed things up. Cache hit rate: 97%. But that 3% miss causes a thundering herd that overwhelms the DB every 5 minutes.
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