I'm using the official 64-bit AppImage from the Jaxx website. I've tested it with the latest version of Linux Mint (19.1) and it has the same issue. Another laptop runs Jaxx a fully updated 64-bit version of Windows 10 Home. It has the same issue too. The market, portfolio, and wallet does not update in real-time, not even close to it. It often takes up to a minute or worse. And it has nothing to do with my devices or internet connection. I may as well buy a print version of market data if a digital copy isn't going to be instantaneous or at least take less than a minute let alone seconds to update. The news feature also slows down both machines, one powerful the other not so much. Clearly this slow functionality is systematic with Jaxx Liberty, although the transactions are relatively efficient. But its main purpose is not to process transactions but to store crypto, so its matching features like portfolio data should be as efficient.
I haven't used ShapeShift to exchange crypto via Jaxx Liberty, so I cannot comment on that. For my purposes, I only needed it to store and send crypto to other exchanges. Those features work perfectly, though you have to be careful to use the addresses it recommends for receiving as these change everytime you receive the respective asset. But for any transaction, cash, credit/debit card, wire transfer, ecommerce payment, and so on, you should do that anyway!
Overall, I don't understand why I should a software that is so slow to update useful information about my portfolio. In the same time it takes to update I could have called someone else who looks after my portfolio to give me that information. I don't have a someone else nor should I need one when I can have a software do it for me. Jaxx Liberty should be that software, but it falls very short of doing that. When there are alternative wallets to use, Jaxx Liberty is a fail for me.