It's field density, not temperature! Modifying the electric field strength in a microwave experiment can completely change the outcome of a reaction. Whereas a low field strength in Grignard reagent formation from Mg metal and aryl halide leads to acceleration of the initiation step, using a high field strength at the same temperature suppresses Mg insertion, favoring solvent decomposition and passivation of the Mg metal (see scheme).
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Gutmann et al. (2011) studied this question.
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