There is some kind of network problem that causes 3 to 10 second latencies when I look up web pages at home with DSL but is not so bad at the gym with cable. I think DNS is involved.
It used to be that a left hand swipe and a right hand swipe would bring up different menus but now I have to swipe multiple times to count through the menus. It's that kind of hamhanded design that make people think bigger devices are unwieldy
While not your biggest issue by far: you can change the colour scheme of the Lollipop keyboard in its settings. "Material Dark" is a far more attractive setting (and I think the "Holo" settings will make it look like the older keyboard).
On my first edition Nexus 7 it has slowed down everything considerably, it is borderline unbearable to use it for anything now, even just browsing web pages is an uncomfortable experience. The lagginess combined with the double-gestures required for unlocking and getting to settings is especially frustrating. I used to love this device, but now I feel like it's working against me.
