Supersize mod Superslow ?

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Hi again
Just tried the various mods to see what they look like, and I have a problem with Supersize HW mod : my rig usually playing SF at 60 fps with all options set to high drops to 7 fps with the mod !
What's funny is that the 7 fps are constant whatever the detail level, putting them High or Low doesn't make any difference . Even with all set to Slow, with a screen view with nothing more than the star background it's that slow...
Where does this come from ? Is there some CPU bottleneck "created" by the mod - I thought it was just a graphics mod with big planets (that are much better than the stock smallish planets btw) ?