Models are taken from the OCC web-site.

Using shipped binaries (release, win32, vc9)
Minimum of about 5 runs

HW: Windows 7, Core-i5 M460, 4GB RAM

Commands in DRAW:

tclean s
chrono c start
vdisplay s
chrono c stop
chrono c show

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shaver.brep

6.3.1:

Elapsed time:  0 Hour(s) 0 Minute(s) 1.188 Second(s)
CPU user   time: 1.1700075 seconds
CPU kernel time: 0 seconds

6.5.4:
Elapsed time: 0 Hours 0 Minutes 2.09668485005 Seconds
CPU user time: 2.0592132 seconds
CPU system time: 0 seconds

----------------------------------------------------

cylinder_head.brep

6.3.1:
Elapsed time:  0 Hour(s) 0 Minute(s) 1.473 Second(s)
CPU user   time: 1.4508093 seconds
CPU kernel time: 0 seconds

6.5.4:

Elapsed time: 0 Hours 0 Minutes 3.283711305 Seconds
CPU user time: 3.276021 seconds
CPU system time: 0.0156001 seconds

----------------------------------------------------

F1.brep

6.3.1:
Elapsed time:  0 Hour(s) 0 Minute(s) 0.768 Second(s)
CPU user   time: 0.7644049 seconds
CPU kernel time: 0 seconds

6.5.4:
Elapsed time: 0 Hours 0 Minutes 2.35978769942 Seconds
CPU user time: 2.3712152 seconds
CPU system time: 0 seconds

----------------------------------------------------