Hurri/Spit, both have the Merlin, so why is the hurri so much slower?

[HauptmannMolders]

I have to assume this also comes down to aeordynamics, simply have a look at how thick the wings are on the Hurri, they are positively massive! Also (and this is splitting hairs) wouldn't the fact that the Spitfire is aluminium vs the fabric of the Hurri cause less friction with the air? Lots of reasons I guess...