What is mdworker Process on my Mac?

Mdworker is a process that indexes all your files, so when you search for something in the search bar, the process is a lot quicker, also it helps with the navigation speed. It is a pretty important process, but sometimes it bugs itself and it causes to slow down your mac. There is always the thing that a restart may solve the problem, if not, you can disable then enable it back, and it should help fix the problem. This is an article that talks about this process and the problems that come with it osxtips.net/mdworker-mac/

mdworker does the heavy lifting for Spotlight indexing.

It will run several tasks for an hour after a major upgrade to update the index, then subside.