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Performance Optimization

Performance Optimisation is the engineering practice of making software faster, more efficient, and more cost-effective. Whether optimising database queries, reducing page load times, improving API latency, or reducing cloud infrastructure spend, performance skills directly translate to better user experience and lower operating costs.

What is Performance Optimization?

Performance optimisation covers profiling and benchmarking to identify bottlenecks, database query optimisation (indexing, query plans, N+1 elimination), caching strategies (Redis, CDN, memoisation), algorithm complexity analysis, frontend performance (code splitting, lazy loading, Core Web Vitals), API latency reduction, and cloud cost optimisation. Tools include New Relic, Datadog, Chrome DevTools, Lighthouse, and flame graph profilers.

Why Performance Optimization matters for your career

A 100ms improvement in page load time increases conversion rates measurable. Database query optimisation can reduce infrastructure costs by 80% in poorly optimised systems. Engineers who can identify and fix performance problems at any layer of the stack are invaluable and often prevent costly infrastructure scaling decisions.

Career paths using Performance Optimization

Performance optimisation skills are part of every senior Software Engineer's toolkit and are specialised in Platform Engineer, SRE, Infrastructure Engineer, and Frontend Performance Engineer roles.

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Frequently asked questions

Where should I start when optimising a slow application?▼

Measure first, never guess. Profile the application to find the actual bottleneck — most of the time, a tiny fraction of the code causes the majority of the slowness (Pareto principle). Common hotspots are database queries, external API calls, and inefficient loops.

What are Core Web Vitals?▼

Google's Core Web Vitals are user-centric web performance metrics: LCP (Largest Contentful Paint — loading), FID/INP (interactivity), and CLS (Cumulative Layout Shift — visual stability). They're also a Google ranking factor.

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Related skills

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