Premiere Pro CC 2018 is Too Slow!

Not too pleased with the latest update of PP.  It is so slow that it is practically unusable to me.  Just trying to play my timeline with simple unmodified videos is not possible anymore as the lag is too much.  I have cleared my cache, turned down playback resolution, and tried everything I can to at least make it usable but it is just too slow.

I am running an aged PC Windows 10 workstation but I have a processor with 6 cores, 16GB of RAM, and a decent video card.  Just a few weeks ago before the 2018 update everything was fine and PP was quite peppy.  I am not sure if there is anything else I can try or not.  To me it seems like something is just bad with the latest update.