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+Improved: FEEvaluation::get_gradient() and FEEvaluation::submit_gradient() are
+now considerably faster for Raviart-Thomas elements on non-Cartesian meshes.
+The previous algorithm used non-optimal loop layouts for the local tensor
+contractions in the derivative of the Piola transform, which have been
+transformed to optimal-complexity variants.
+<br>
+(Martin Kronbichler, 2023/09/12)