ID 342290 - Custom colorspace configs may cause selection speed to slowdown

Problem summary
Custom colorspace configs may cause selection speed to slowdown

Customer reported version
3.3v1 
Customer reported platform
CentOS 6.4

Steps to reproduce

1) Create a new Mari Project

2) Set File > Settings > OCIO Config to 'Custom' and load a custom config.ocio file

3) Change to the Select tool [S]

4) In Patches selection mode, drag to select several areas. Observe that there is a noticeable slowdown in the selection.

Workaround
Unknown. 

Reproduced by development team
See internal comments for details.

Expected behaviour
Irregardless of the config, selection speeds should be consistent and unaffected by color management

Actual behaviour
Color management seems to uncharacteristically slow down selection speed