Pillar 2 · Technical SEO & Infrastructure
Technical SEO, Site Speed, and Core Web Vitals
Updated 2026-10-24 · SYS CRED · Prince George, BC
Direct answer
Technical SEO covers whether your URLs are indexable, fast, and stable: Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift, and HTML that crawlers can read without depending on client-only JavaScript. Speed affects both rankings and conversion.
Core Web Vitals that still matter
LCP: paint the main hero image or heading quickly — optimize images, fonts, and server response time. INP: keep main-thread work light so clicks respond quickly. CLS: reserve space for media and ads so the layout does not jump.
Lab scores help during builds. Field data in Search Console and CrUX reflect real users on Canadian networks, including Interior BC cellular.
SSR, hydration, and crawl efficiency
Server-rendered HTML with real content in the first response is safer for SEO than a blank shell that fills after hydration. Choose the approach per template.
Cache marketing pages at the edge, set sensible cache headers, and avoid large client bundles on service pages.
- Prefer static or SSR for service and blog templates
- Lazy-load below-the-fold media
- Remove unused third-party scripts
Infrastructure choices that affect SEO
A headless CMS is fine when the front end stays fast and staging previews are not indexable. Edge hosting helps time-to-first-byte for visitors across Canada.
After every redesign, check 404s, redirect chains, and sitemap freshness.
Frequently asked questions
Does a 100 Lighthouse score guarantee rankings?+–
No. It removes friction. Content, links, and search intent still decide rankings.
Is client-side rendering always bad for SEO?+–
Not always, but marketing pages should not rely on it for primary content.
How often should we re-test CWV?+–
After major releases, and monthly for key templates.