Hi Leo,
Thank you for your message.
This is a known problem and it stems from the architecture of this connection mode. We, however, do plan to update the File Transfer mode so that it works faster in this respect. This can happen in one of the upcoming updates.
Unfortunately, do to a lot of more pressing priorities we didn't implement that in this 6.5 update. Sorry for that.
We will surely do our best to make you happy. That's all I can say :)