I notice that the drive properties shows that compression is enabled.
I assume the 88.8 figure would be even higher without compression.
Or is it possible that the WinDirStat 51.2 figure represents post-compression and 88.8 is without compression?
Re page file: all I have read suggests that you should still use a small one---some programs expect to find a page file of some type. I use 1 GB minimum size and 2 GB maximum size.