From the image it looks like you are deleting the files through
Explorer, which is the slowest method possible.
What you can do to improve:
-
Delete the files using Shift+Del so the
deleted files are not moved to the Recycle Bin
(no recovery possible)
-
Issue the delete from inside a Command prompt using a command
similar to (use del /? to see all parameters):
del /f /q *.* (del in current folder, add `/s` to traverse sub-folders)
del /f /q /s folder
