ID 242593 - Poor performance with the UV Relax adaptive tool

Problem Summary
Using the UV relax tool in Adaptive mode offers very poor performance and can often freeze the system. This is especially true with more complex meshes and when using the tool interactively.

Customer reported version
10.1v2

Expected behaviour
For it to offer better performance, or warn you when you are attempting a seriously heavy operation

Actual behaviour
Causes the system to freeze while it calculates the operation. Significantly worse when using the tool interactively

Steps to reproduce

1) Open attached file
2) Select the 'Sample' mesh
3) UVEdit layout
4) Select the Texture UV map
5) UV Relax: Adaptive
6) Clicking and dragging in the viewport will hang the program for several minutes
7) Select an individual island in polygon mode
8) UV Relax: Adaptive
9) Takes several seconds to evaluate - it is very slow

Workaround

-