SEO impact during migration — will my rankings drop?

If done right, no. If done wrong, yes — but it’s preventable. The risk areas:

• URL structure changes: none, if you keep the same Magento URL rewrites. Hyvä is a theme layer, not a URL change.
• Schema markup: Hyvä emits product/breadcrumb/organization schema by default. Verify it matches your current structured data, port any custom JSON-LD.
• Meta tags + canonical: handled by Magento core, so Hyvä doesn’t change them. Verify after cutover with a crawl.
• Page speed (positive): Lighthouse 95+ improves Core Web Vitals, which improves Google rankings on competitive queries. The lift usually shows up 4 – 8 weeks post-cutover.

Standard playbook: full Screaming Frog crawl pre-cutover, same crawl post-cutover, diff every node. Submit updated sitemap. Rankings hold or improve within 2 months in 90%+ of cases.