Curve Editor very slow to open and edit

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The scene I am working on is very huge in terms of poly count. I am using layers effectively to manage my scene and very easily doing what all is required. The problem arises when I start try to open curve editor while animating a standard 3ds max camera. It takes 4-5 mins to open and then 1-2 mins to each operation I perform (adjusting curves or even adjusting keys). There is nothing on the camera, no constraints, no links, its just a normal camera I am working with.
My file size is close to 2 GB. I hope that is not causing the problem.
Any one faced similar problem. What could be the solution or any other alternate way to manipulate curves?
(I have also tried the mini curve editor in animation track bar also and facing same issues)
Thanks
Parminder Singh
Max 2014, SP5, Vray 3.0