Writing to 2 new PNY 64 GB Turbo USB 3.0 flash drives get very slow & pause?

Hello.

Why does writing 4,189 small files, from a downloaded and extracted
http://repo.steampowered.com/downloa...SInstaller.zip from
http://store.steampowered.com/steamo...ad/?ver=custom on a SATA
HDD, to a new PNY 64 GB Turbo USB 3.0 Flash Drive (formatted as exFAT)
get really slow and even pause sometimes in my few months old work's
Lenovo Thinkpad P50's laptop/notebook's updated Windows 10 EE? This is
with a USB3 port too. http://i.imgur.com/7sLhDRg.jpg for a screen
capture/shot of W10's Resource Monitor in action with 0 bytes/s with
another SAME drive model.

Thank you in advance.
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