After an earlier problem report, I was using driver version 18.104.22.168 under Windows 7 64-bit, which worked well from my perspective. This month, Microsoft update pushed version 22.214.171.1242 of the driver onto my machine. Now, my terminal emulator responds slowly. I can easily type ahead several characters before the emulator echos them back to the screen.
The behavior is definitely related to the version of the driver. When I use the older version, the terminal response is immediate. When I use the newer version, the response is sluggish. It’s very counter-productive.
Because the newer version is pushed by Microsoft update, it sometimes installs without my consent. If I move the adapter to a different USB port, it will use the newer driver automatically, and I have to go through the process of reinstalling the older driver.