SEO migration is a set of technical actions designed to maintain your search rankings and organic traffic when your website undergoes significant changes. This process is essential when switching domains, moving to a new CMS, updating URL structure, or performing a full redesign. Without proper migration, a business can lose 70–90% of its traffic — and therefore leads and sales — immediately after launch.
Think of it like forwarding your mail after moving to a new home. You notify the postman (Google) that you no longer live at the old address and ask to deliver all mail (traffic) to the new one.
Re-indexing usually takes from 2 weeks to 2 months, depending on site size.