isDnsQuickCheckDisabled

Indicates whether DNS Quick Check is disabled in proxy resolution.

By default, it is enabled.

This is a performance optimization for WPAD (Web Proxy Auto-Discovery) which places a 1-second timeout on resolving the DNS for PAC script URLs.

For instance, if the DNS resolution for WPAD takes longer than 1 second, auto-detection will give up and fallback to the next proxy configuration (which could be manually configured proxy server rules, or an implicit fallback to DIRECT connections).