Deleting many objects takes too long

I just had a layer with some 30000 assorted points, curves, surface and meshes. I wanted to get rid of them, because they were no longer relevant.

Strategy 1:

  1. set layer visible (yellow light) (takes more than 1 minute)
  2. select objects in layer
  3. delete (I had to kill rhino after 10 minutes at full CPU, this takes too long)

Strategy 2:

  1. set layer invisible (blue light)
  2. delete layer (takes a couple of seconds).

Why is there such a difference in time to delete large number of objects?

Is it possible to see the file that is giving you grief? Feel free to email it to me directly if needed (

– Dale