rmdir impossibly slow

[ccb]

[C:\work\MSI\branch]
>ver
TCC 12.01.44 x64 Windows 7 [Version 6.1.7601]

I started the rmdir op show below; tcc.exe was spinning the CPU, but didn't seem to be deleting any files. I finally used Ctrl^C to stop the op, and called timer again to get the elapsed time.
The dir is a subversion dir; stats from a similar dir:
741,035,467 bytes in 7,455 files and 3,838 dirs

Deleting a similar directory in Windows Explorer takes a couple of minutes.
What's going on with TCC?

C:\work\MSI\branch]
>timer & rmdir /s /k ArrangerSpacing\ & timer
Timer 1 on: 14:07:17
C:\work\MSI\branch\ArrangerSpacing\* : Are you sure (Y/N)? Y
^C
[C:\work\MSI\branch]
>timer
Timer 1 off: 15:10:25 Elapsed: 1:03:07.94

[C:\work\MSI\branch]
>

 

[rconn]

TCC is updating the fuzzy directory index on each directory deletion. Use the /NT switch to disable that.

 

[ccb]

Thanks, for the quick reply.
"rmdir /?" mentioned "/N(o errors)", but not what the "/N[et]" options would do.