Mapping Operator makes simulation very slow

[ldotchopz]

In the file i have attached you can see 1000 instanced animated shapes working in realtime, but if you switch off the fast sim and turn on the slow sim that contains the mapping operator things begin to get very slow.

This is a simple recreation of something i am trying to apply to more complex objects, and with that scene its impossible to get any kind of playback. from 40 fps to 3fps

Is there any way to improve the speed when using a texture map to drive a property?

Thanks