I have a 27 GB plan with sky drive.  I recently undated windows to 8.1 but syncing on skydrive is extremely slow.  I left the laptop on overnight to that the upload could be complete.  In the space of over 8 hours, only 2 files had uploaded.  None of the files are larger than 250 MB. 
I have tried the following:

1. restarting Windows. 
2. closing skydrive from task manager and restarting it

Please advice.

Sincerely,

Ajay