Slow performance when charging?
I’ve been chasing a problem for the past few months and it seems to be related to when the laptop is charging. Using Cinebench r20 on battery, I get around a 2300. But as soon as I plug in my dock or charger, it drops to around 1600.
I’ve cleared the SMC and PRAM, booted into safe mode, ran the hardware test, but nothing seems to make a difference?