コアウェブのバイタル
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience. They measure Loading performance (LCP - Largest Contentful Paint), Interactivity (INP - Interaction to Next Paint), and Visual Stability (CLS - Cumulative Layout Shift). These metrics are confirmed Google ranking factors.
Translation Plugins Can Kill Your Rankings
A poorly coded translation plugin that loads heavy JavaScript can destroy your Core Web Vitals, causing rankings to drop even if the translation quality is perfect. Common issues: language switcher widgets that load late and shift page layout (bad CLS), bloated translation libraries that delay page rendering (bad LCP), and unoptimized scripts that freeze interactions (bad INP). MultiLipi is engineered specifically for Core Web Vitals: edge-delivered translations add <5ms overhead, language detection happens server-side (no layout shift), and all assets are minified and cached. Passing Core Web Vitals is mandatory for competitive rankings in 2026.
Good vs. Bad Core Web Vitals
現実世界の影響
Site uses heavy translation plugin with late-loading flag menu
CLS score 0.32 (menu shifts after 2 seconds)
Rankings drop 5-8 positions, traffic -40%
Switch to MultiLipi with server-side rendering
CLS score 0.04, LCP improves from 3.8s to 1.2s
Rankings recover, traffic +65% within 2 months