This is either Norwegian or Danish.

It’s true that ‘fart’ means speed in Swedish, but in this context ‘hastighet’ would be used (~‘hastiness’).

I guess this is where we get “haste”?

It’d be more accurate to say they share the same origin. Swedish and English are both part of the Germanic language family.

English has a lot of influence from both Germanic and Latin, to the point where I don’t think it’s reasonable to classify it as a strictly “Germanic” language.

There are plenty of English words that can be traced to old Norse (i.e. Norwegian Viking occupiers, raiders, and/or traders).