Duplicate URLs don't just hurt indexing — they tax crawl first

Duplicate URLs don't just hurt indexing — they tax crawl first

The usual worry about duplicates is split signals and canonical confusion. The earlier, quieter cost is crawl: Google has to fetch every duplicate to discover it's a duplicate. Five URL variants of one page is five fetches to learn one thing.

Session IDs, tracking parameters, trailing-slash variants, http/https/www permutations, uppercase paths — each multiplies the URL space Google must crawl before canonicalizing. On a large site that's a serious recurring drain, paid every crawl cycle.

canonical helps with indexing but not crawl — Google still fetches the duplicate to read the canonical tag. The real fix is not generating the variants: consistent URLs, parameter discipline, one host.

Duplication is a crawl bill before it's an indexing bug.

Fewer URLs for the same content. Always.