Hot Path
ELI5 — The Vibe Check
The hot path is the code that runs the most — the fast lane of your application. It's the checkout flow in an e-commerce app, the message handler in a chat app, the render loop in a game. You optimize the hot path because that's where performance actually matters. The settings page that 3 people visit per month? Not the hot path.
Real Talk
The hot path (or critical path) refers to the most frequently executed code paths in an application. Performance optimization efforts should focus on hot paths because improvements there have the greatest impact. Profiling tools identify hot paths by measuring execution frequency and time. Optimizing cold paths is usually premature optimization.
When You'll Hear This
"Don't add logging to the hot path — it'll tank performance." / "Profile first, then optimize the hot path."
Related Terms
Benchmark
In AI, a benchmark is a standardized test that measures how good a model is — like the SAT for AI.
Latency
Latency is the delay before data starts moving — the time it takes for a request to go from your device to the server and back.
Performance Budget
A performance budget is like a calorie limit for your website.
Premature Optimization
Premature Optimization is Knuth's famous warning: 'Premature optimization is the root of all evil.