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Ship Notes · SN #16·12 Apr
Performance users actually feel
Fast on your laptop means nothing. Two notes on the performance that shows up where your customers really are.
1. Measure on the real device
Your app is fast on a new laptop and office wifi. Test it on a mid-range phone and a slow connection — that's where most of your users live, and where the gap between “feels fast” and “feels broken” is decided.
2. Mind the N+1
The quiet performance killer is a loop that hits the database once per row. Fetch in batches, watch your query counts, and a page that felt slow for months often gets fast in an afternoon.
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SN #15 — Observability before the incident