Magento performance can be constrained by code, extensions, JavaScript, media, caching, search, indexes, cron, databases, servers, third-party scripts, or traffic patterns. The best audit identifies root causes and produces a prioritized implementation plan rather than a generic checklist. An audit should specify:Real-user and laboratory measurement across important page typesCore Web Vitals, TTFB, throughput, and peak-load behaviorFrontend, code, extension, cache, server, and database analysisSeverity, expected impact, effort, dependencies, and implementation orderBaseline evidence and post-fix validation1. AmastyAmasty ranks first for acore web vitals auditbecause it offers two appropriately different scopes. A focused Core Web Vitals review targets user-experience and search metrics, while a deeper technical performance audit examines application behavior, frontend delivery, Magento code, extensions, caching, servers, and databases.