This one is weird and I'm wondering if anyone else is seeing similar: Was running Win *8* on Mtn Lion via PD9 on a 2012 15" retina Macbook Pro, and all was well. Very snappy performance. Last weekend I decided to upgrade to Mavericks, so I first installed the "mavericks patch" for PD9, then upgraded to Mavericks, then installed a NEW Win 8.1 guest. Inside this guest things are wonky... for example, dragging a window or icon rapidly around the desktop induces noticeable (and highly annoying) lag where the object simply cannot keep up with the mouse pointer (it lags inches behind). If I then drag the same objects to an external monitor (running at 1280x1024... it's ancient) there is NO LAG at all and the objects-being-dragged can keep up with the mouse without issue. So then I fired up my older Win8 VM and unfortunately it immediately installed the new PD9 Tools (so I can't compare to its old, good, behavior), and it too has this NEW sluggish behavior... which makes me think something is wrong in the new graphics driver, since it wasn't acting up BEFORE the new PD9 tools were install... but the underlying PD9 engine and Mavericks were also new since I last ran that VM, so it's impossible to tell. Bottom line: something is really amiss with 2D graphics performance since upgrading to PD9 patch (and yes, I'm now running 9.0.23140 with same results) on Mavericks. The overall performance of the VM seems normal, it's just graphical lag that has been introduced... and it seems to be only on the retina display. Anyone else?