Sluggishness on your system running Linux can be caused by numerous factors – among them is a process called gvfsd-metadata.
From what I’ve heard other people say, its caused by fragmentation – possibly due to a partition that’s nearly full.
All you can do is terminate the process or delete the script from your ~/ folder.
rm -rf ~/.local/share/gvfs-metadata
Every now and then its a good idea to make sure that your home folder is not filled up past 90% or so.