This has to be a localized issue with some users.
I haven't noticed any degradation from my work PC, home laptop, iphone, or ipad. 4 devices and no issues whatsoever.
Semantics. Pulling off a +20 like you're talking about would take some obscene daily high and low. right now. We'd be talking record heat levels to pull off. Show me some charts that have hill towns pulling off a 90F high and 65F low in the next couple weeks..