I had that problem for a while. The slow aspects where I had to wait for things to resolve seems to have finally gone away. Not sure when the slow aspect ended, but it seems to be gone and am back to normal with the previous version.
I downgraded to 102. I much prefer the 102 layout. However, the slow response and "not responding" messages still occur with 102. That all started with 115 and the downgrade did not help.
I could probably deal with 115, except that it is slow and I keep getting "Not Responding." I simply have to wait for it to become active again and respond. That takes quite a while and is annoying when you are trying to read an email or create a new...