Browser & Web Performance · Senior · Question 62 of 75

Why is 'domain sharding' an anti-pattern with HTTP/2?

✓Correct answer: It forces extra DNS lookups and TLS handshakes and splits prioritization across connections
2HTTP/2 can't load resources from subdomains
3It breaks HTTPS certificates

Explanation

Sharding helped with HTTP/1.1's per-host connection limits. With multiplexing, one connection is more efficient.

Further reading

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