Wipe free space taking a long time?

[switchs]

So everytime I've ran wipe free space I feel like its never taken more than 2 hours/3 tops.  I ran it yesterday and it ran for about 12 hours and it just got past MFT part and only got 12 percent in but my gpu crashed randomly and I had to reboot.

 

I deleted the files it left in root and reinstalled it because of how long it took I thought something was corrupt, so I ran it again and 7 hours later its still only on the MFT part.

 

I'm running it manually through tools this time I usually do it through cleaner part I dont know if thats it, but is there a reason its taking so long now?