SEO risks of switching CMS
A CMS change is not a design project — it's a search event. Google recrawls, reindexes, and re‑ranks your entire site inside a 30‑day window. Get it wrong and you'll spend a year climbing back. Here's what actually goes wrong.
1. URL drift — the silent killer
New CMSs love to 'clean up' URLs: trailing slashes appear, /blog/ becomes /articles/, category slugs change. Every changed URL is a lost backlink unless you redirect it 1:1.
The fix: crawl the old site with Screaming Frog, export every 200 URL, and build a redirect map BEFORE the new CMS is chosen. If the new CMS can't honour the old URL structure, it's the wrong CMS.
2. Schema and structured data vanish
Rich results — FAQ, HowTo, Product, Article — are usually hand‑wired into the old templates. New CMS themes rarely carry them over. You lose SERP real estate the day you launch.
4. Redirect chains > 1 hop
Old CMS → new CMS often stacks on top of an existing http→https redirect. Now every crawl costs 3 hops of link equity. Flatten every chain to a single 301.
5. Internal links point at the old CMS
Hardcoded absolute links inside blog posts (a/href to the old domain, /wp-content/ image paths, /pages/ Shopify slugs) survive the migration invisibly. Search‑and‑replace at the database level before cutover.
6. XML sitemap and robots.txt reset to defaults
New CMSs ship with generic sitemaps that include tag pages, author archives, and paginated listings you spent years pruning. Submit a clean sitemap on day 1 or Google re‑crawls the mess.
Priya owns the SEO side of every migration — redirect maps, canonical parity, schema preservation. Ex‑in‑house SEO at two SaaS unicorns, now the person we call before touching a single URL.
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