Hello Michael!

I did a quick test with a super huge 130Mb Step files downloaded from GrabCad.

I have used the Open command rather than the Import command.

Here are the results :

TEST 1 : 130Mb of Step file
Moi V4 Beta 12 May : From Open to full model redraw in the 4 view : 8 min and 14 secs
Moi V4 Beta 06 Jun : From Open to full model redraw in the 4 view : 3 min and 10 secs (Total amount of Ram : 6.2 Gb)

TEST 2 : 32Mb of Step file
Moi V3 : From Open to full model redraw in the 4 view : 46 secs
Moi V4 Beta 06 Jun : From Open to full model redraw in the 4 view : 15 secs

Very good improvement!

My config :
i7-7700K 4.5 Ghz 4 Cores/8 Threads
32Gb DDR4 3000Mhz
Gpu Overclocked custom version of Nvidia Gtx 1080 Ti

But I have a problem with another step file (20Mb).

Moi V3 didn't load it and Moi V4 Beta 06 Jun stopped loading at 36% and the "Cancel" button didn't work, that is, Moi was not frozen but the command has not been cancelled.

You can download and test the file on your own : http://take.ms/slQI1

Have a nice day.