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Application using this process: Bonjour
Recommended: Scan your system for invalid registry entries.
What is dnssd.dll doing on my computer?
dnssd.dll is the Bonjour Client Library by Apple for developers. According to the description on Apple's website: "Bonjour, also known as zero-configuration networking, enables automatic discovery of devices and services on a local network using industry standard IP protocols. Bonjour makes it easy to discover, publish, and resolve network services with a sophisticated, yet easy-to-use, programming interface that is accessible from Cocoa, Ruby, Python, and other languages."
Non-system processes like dnssd.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.