Performance :: Slow Performance With Low Battery

Asus UX305F laptop I bought last week. It's working fine apart from a couple of things:

- When the battery is getting low, say from 10% and down, the performance drops dramatically and everything, particularly the internet, runs so slow that it's almost impossible to use until I reconnect the charger. I've changed the on-battery power settings to match the performance settings when it's plugged in and it hasn't made any difference.

- When I'm using the laptop in my bedroom which is adjacent to the living room where the WIFI signal is coming from, the connection is extremely slow, much slower than my mobile phone for example. In the living room I average about 50mbps whereas in the bedroom I'd be lucky to get 20mbps though my phone can get about 40mbps in the same room.