Nexus 7 (2013) slow USB transfer, messy file browsing

Nexus 7 (2013) slow USB transfer, messy file browsing

Working with Ubuntu 13.04, connecting my Nexus 7 (2nd gen, 2013) via MTP
works fine. I just connect the Nexus 7 and Nautilus immediately opens up
in the correct directory. No more need to fiddle around with third-party
tools as suggested here.
There are two issues that are really bugging me, though:
Transferring files via USB is really slow. I am using USB 3.0 but Nautilus
says my transfer rate is fixed at about 1MB/s which is way too slow for
USB 3.0. This might be a problem of calculating the correct transfer rate
but I can tell you that the transfer speed is nowhere near the full
potential of USB 3.0
Navigating files on the Nexus 7 is quirky. This might be an MTP issue but
it just feels odd. If I create a new directory on my Nexus 7 via Nautilus,
I need to "refresh" the current directory (i.e. move to the parent
directory and enter the subdirectory again) so that the newly created
directory becomes visible for me.
My USB works fine using other devices such as flash drives and USB HDDs.
I haven't found any advice on these problems yet and I'm not sure whether
this affects others as well.