As with comparing battery life across N5 users - there are waaay too many variables in the mix. MM is not generally known to have this issue and I find this site to be horribly slow lately. I thought they were doing site maintenance but this has been days now.
On a related note - are you using Sammy's browser? I find it to be blazingly fast. Leaves Chrome in the dust. Plus, there's a ad-block plug-in that works great. Goodbye Chrome.