Slow computer when working with imported surfaces.

Hi All

Can anybody give me any tips for speeding up Solidworks when working with imported iges files?

It seems to be very demanding on the cpu and takes a long time trying to process models, fill faces etc.

I am just tying to get the models repaired and to a solid body state so I can then scale and cut the models.

Computer is i7 4770 with 20 Gb of Ram.

Thanks

SolidworksSurfacing