Translate the following English sentence to French:
"It is contrary to the principle of proportionality and, most importantly, it is contrary to the rules of the WTO which require the use of performance standards, not design standards, as is the case in this regulation."
C'est contraire au principe de proportionnalité et, plus important, c'est contraire aux règles de l'OMC qui exigent d'utiliser des normes de performance et non des normes de conception comme c'est le cas dans ce règlement.