After effects CC 2014 slow with scripts


I’m creating an after effects project with CS5 but when I test it in AE CC 2014 the project is really slow. When I test in AE CC 2015 works fine and fluid.

The project use scripts to set colors and other options.

I read in some forums that this version has problems with scripts.

Did anyone have this problem?
Is there a solution?
Could this be a reason to be rejected?