ID 225628 - Nuke takes a lot of time when Roto node overlay is hidden in this script

Problem summary
Nuke takes a long time to hide Roto node overlays.

Customer reported version
nuke.10.0v3

Customer reported platform

n/a

Steps to reproduce

1. Open attached script (MSM0325_roto_v001_forFoundrySlowRoto_TEST.nk)

2. view through the node "Grade2"

3. Double click on "FRONT_ETCHINGS" roto node

4. In the viewport select all points on the roto

5. Hit the "q" hotkey to hide the overlay of the roto.

6. Nuke takes a long time hiding the roto overlays

7. Now hit "q" to reveal the overlay on the roto

Reproduced by support
Reproduce by support. Nuke 8.0v6 to 10.1 (Windows 7)

Expected behaviour
Roto overlay hide/reveal action should happen quickly.

Actual behaviour
Nuke hangs fro a while when Roto overlays are hidden or revealed

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