SEO
Multilingual SEO handled automatically so search engines index the right language for every visitor.
Automatic Hreflang Tags
PerfLocale tells search engines about every translated version of each page. Choose page source, HTTP headers, or both for maximum coverage.
Sitemap Integration
The built-in WordPress sitemap is extended to include links to every translation. Search engines discover all your translated content automatically.
Cached for Performance
SEO tags are cached and refreshed automatically so they never slow down page loads. Cache clears itself when translations change.
Smart Plugin Detection
If you use Yoast, Rank Math, SEOPress, or AIOSEO, PerfLocale automatically disables their hreflang output to prevent duplicate or conflicting tags.
JSON-LD Schema Enrichment
PerfLocale augments the structured-data output of Yoast, AIOSEO, Rank Math, SEOPress, Slim SEO, and The SEO Framework. Every WebPage/Article/Product entity in the schema graph gets the correct inLanguage value, and translated siblings are cross-linked via workTranslation. On by default; zero runtime cost. Read the JSON-LD schema enrichment docs.
Modern SEO & UX
Five opt-in features that address gaps specifically affecting multilingual sites - each solves a problem that a generic SEO plugin can't, because only a translation-aware plugin knows the sibling graph and the fallback state.
IndexNow Push-Indexing with Sibling Coordination
When you publish or edit a translation, PerfLocale pings Bing, Yandex, and (via the Cloudflare relay) Google to re-crawl within hours instead of days. Unlike generic SEO-plugin IndexNow (Rank Math, Yoast) which only pushes the edited URL, PerfLocale also pushes the sibling translations whose hreflang alternates just changed - only a translation-aware plugin knows the sibling graph. The 32-character verification key is auto-generated on enable and served natively at {host}/{key}.txt with constant-time comparison. Fires with blocking=false so your publish workflow isn't delayed. Works alongside any existing IndexNow integration.
Content-Language HTTP Header
The W3C-standard Content-Language response header tells search engines and proxies the page's language in BCP-47 format (de-DE, fr-CA, etc.) on top of <html lang>. Google, Yandex, and most CDN/proxy layers use it as a ranking signal. No downside - on by default.
Fallback-Content Snippet Guard
When a translation is missing and you show the default language as fallback, Google indexes the English text under the /de/ URL - and happily serves English snippets in German SERPs, confusing visitors. PerfLocale wraps the fallback block with data-nosnippet so Google still indexes the page but omits the mismatched text from snippets. On by default; only triggers when fallback is actually active. No other multilingual plugin does this.
Instant Language Switching
When a visitor hovers or focuses a language-switcher link, Chromium prerenders the target translation in the background. Language switch becomes effectively instant - the page is already loaded by the time they click. On WordPress 6.8+, PerfLocale integrates with Core's native Speculation Rules API via the wp_load_speculation_rules action - our rule lands inside Core's single speculation-rules script, automatically inherits any /cart/*//checkout/* exclusions other plugins register, and respects the global opt-out filter. On older WP it falls back to emitting a standalone script with the same behavior. Moderate eagerness triggers only on hover/focus, so there's no bandwidth cost for visitors who never switch.
Smooth Switch Animation
Using the View Transitions API (Chrome 126+, Safari 18.2+), switching between languages crossfades smoothly between the old and new page - no white flash. Browsers without support just navigate normally; zero breakage. Progressive enhancement you can turn on in seconds.
Accessibility: the default CSS respects prefers-reduced-motion - users with the OS-level reduced-motion preference see instant navigation without the 240ms crossfade. WCAG 2.1 SC 2.3.3 compliant out of the box. See the Accessibility page for details.