This is a little known feature on Mac OS which allows you to clear the trash extremely fast compared to the normal “Empty Trash/Bin”.
For example, if you have thousands of files left by some application, or, just want to rebuild files for any application and delete the existing ones, just emptying the trash can take quite some time.
A typical example of this, in my case, would be to delete the preview files in Lightroom or ON1 Photo RAW cache which can have thousands of files.
This is far more apparent if the data is on a HDD, external or internal, rather than a SSD.
One way around this is to use the command line and delete the files and folders using the rm command. Fortunately, the trash/bin in Mac OS has an equivalent which just deletes instead of displaying the file count and its status while emptying the trash/bin.
Let’s see how this works…
Nitin Chandra's Blog 