Don’t panic, as if mDNSResponder is naturally revealed on your Mac, moreover it is installed by Apple. Hence the company always searches for a useful tool for everybody, it was originally aimed to facilitate and ease device usage for its customers and firstly the option managed to do it perfectly. But since Yosemite was released, the company decided to turn it off and replace with discovery, that was unable to serve as the first one. As a result, Bonjour (essential for MacOS system, which is based on the option) faced huge problems and, for sure, it affected to computer performance. So even now sometimes we can face operational bugs.
Bonjour Multicast Domain Name System Responder is the main segment of the Bonjour structure. Bonjour is Apple’s supplying network service, which basically helps Apple devices connect to each other on the network. This process regularly scans your personal network in order to find other devices, connected with Bonjour. But what is Bonjour? In fact, it is something required to have access to local networks, especially to apply simple connections to them. In two words Bonjour is the icon of printer or laptop, located on the sidebar in the Finder. Also, you can see it, when some notification about the usage of another connected device comes to the Doc on a Mac. So that Bonjour is a very important program for a laptop and in turn, mDNSResponder offers a chance for the normal operation.
Is not mDNSResponder virus, that penetrates Mac?
No, the option has no similar to a virus, because it’s a daemon designated to search for services and grant DNS requests instead of them. During device performance, some network problems can really appear, as mDNSResponder floods it with lots of unnecessary information and it causes speed reduction of all computer processes. So how to solve the problem? As for me, I recommend to not to delete or disable the option, because without it the normal activity or even vitality of your laptop becomes elusive. Moreover, you will be forced to enter data for each device manually in a case of connection. If the system function badly, try to clear the cache or you may use any cleaning service, for example, CleanMyMac X.
To sum up: is mDNSResponder advantage or disadvantage for Mac?
For sure, it is a huge advantage. Yes, occasionally mDNSResponder creates system bugs, but they are extremely easy to deal with, unlike viruses. The option offers much more opportunities, then problems.