We have noticed (and had reports) of Syncdocs slowing down when uploading many folders.
It turns out the new Google servers deny every 1 in around 400 folder creation attempts. We are not sure why and have contacted Google about it.
The effect of this bug is to cause Syncdocs to re-authenticate with Google, which slows the upload process down.
Until Google fixes it, there is a workaround to this new Google error in the latest development build.
You can download it from here:
We have tested it on around 100,000 folder creation operations, and it is stable.
Thanks to Rob B for providing detailed logs to help us fix it.