Speeding up global DNS resolution by avoiding CNAMES
10 months ago
- #Performance
- #CNAME
- #DNS
- Using CNAMEs in DNS can help with organization but slows down resolution time due to multiple queries.
- Each CNAME in the chain requires additional DNS lookups, increasing latency, especially for users far from regional servers.
- Global users experience significant delays (e.g., 1.5 seconds in Japan) compared to EU users (0.004–0.070 seconds).
- Removing CNAME chains and delegating subdomains directly to GeoIP nameservers reduces resolution time (e.g., from 1.9s to 0.7s).
- Further improvements could include eliminating zone delegation and ensuring global accessibility of all nameservers.