I have been back and forth with various support team members and I'm going to post it here:
When loading a portfolio (160 entries) it takes 3-6 'scroll downs' to get the entire portfolio loaded on the screen.
They have given me various possibilities, the "other factors" listed further down. Since this is THE ONLY APP ON MY PC THAT BEHAVES THIS WAY i AM CONVINCED THAT NONE OF THOSE FACTORS ENTER INTO WHAT IS CAUSING MY 'PROBLEM(S)'

Adding a cash transaction takes 3-5 seconds before the previous transactions appear after clicking the 'expand' symbol. and then it takes another 3-5 seconds for a new transaction to appear. And then there's this: if I click the mouse or hit the enter key the transaction just added is repeated as many times as the enter key was hit or the mouse button depressed!!!??? And why do you put the cash entry all the way at the bottom of the portfolio listing where it takes much time to get to it much less add a transaction??

Yes, I am aware of the 'other factors' : including internet connection, as well as any antivirus, antispyware, and firewall products but none of my other applications are impacted. i.e., I see no slowness slow response, delayed actions etc, that I'm seeing in Yahoo finance.

I give up. I just wish the system hadn't been "improved" as much as it has!!!!!!!!!

One of my biggest complaints is the lack of 'education', instruction, or manual to explain how all the new functions work. I have found most of them through trial and error but that is no way to roll out a new system.

And please do not patronize me with all the explanations that the reps have given me. I have been working on/with computers since 1966 and have some knowledge how things work or should work