JavaScript Performance: Proven Techniques to Eliminate Bottlenecks

Not all performance optimizations deserve equal effort—this guide focuses on the eight techniques that deliver measurable results. From debouncing and throttling event handlers to implementing lazy loading and leveraging browser APIs, these strategies address the most common JavaScript performance pitfalls developers face. Applying even a subset of these practices can reduce function calls by orders of magnitude and cut initial page load by 30-70% for image-heavy sites.