Krusty,
Keep in mind the Meteor Mk III would also have poor acceleration. Early jets just did not produce that much thrust.
As to your 30mm quip, I don't think there is anything wrong with the 30mm cannons. I recall reading, long ago so don't ask for a refernce, a German pilot saying the Me262 would have been better if they'd armed it with four 20mm cannon as the 30mms were too hard to hit with at the speeds it flew.