On Topic:
I think tablets, specifically ipads have a problem where if you hold them horizontally with the home button on the left, you are covering the antenna. That could be causing some wifi-problems for some people. I know I always try to hold my tablet with home button on the right to avoid this, and the antenna stays on the top left with nothing covering it.
I still have spike lags on pc though.
Also, as for the lag, I guess 4k is the average player count due to it being summer now. Hopefully servers will get an upgrade soon. I try to spar, kill baddies, pk, or even catch a butterfly and it's just too laggy to enjoy it.