Such an issue can be isolated by utilizing a DNS application such as DIG which can report how long it took the DNS server to respond. This will only occur the first time the host is requested, or if the local caching period for the host DNS information has expired. Should a DNS server be slow to respond, the initialization of these functions for a new (non-cached) host will result in a delay until the result is provided by the DNS server(s). These functions are isInNet(), isResolvable(), and dnsResolve(). A PAC file may leverage several functions which rely on the local DNS server(s) in order to resolve a requested host.
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