I updated to 2016.2 a few days ago, and since then everything become much more slow - especially debugging, which became almost impossible.
It takes forever to evaluate expressions and use the command line python within the debugger. Also, it sometimes just freeze/hang.
I'm doing some basic numpy/scipy/pandas data analysis, nothing special (running on Ubuntu 14.04 64bit).
Switched back to 2016.1 and everything just works fine (well, besides IPython 5.0 which does not work in 2016.1 and does work in 2016.2..)