Components of tensors in sagemanifolds are nicely simplified through 
methods of chart functions. However, for large and complicated expressions, 
such simplifications are very time consuming. 
Is it possible to turn off these simplifications? I was not able to find it 
along the documentation.

It would be great to have something like

M = Manifold(4, 'M')
M.options.simplifications = False

If have a metric with components given by functions of 
`sage.calculus.var.function`, for example, it take hours to calculate the 
Riemann tensor. Calculating the same Riemann tensor using lists and SR, on 
the other hand, takes only a few seconds.

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