If you are having crappy speeds below your line speed give this a go.
Create a new empty document on your desktop
Enter the following in the file:
Save the file as EACore.ini
Now start Origin. Upon start you will be asked if you want to import the file you just created on your desktop. Press Yes. This will overwrite your old config-file.
Information The EACore.ini file is deleted from your desktop as soon as you import it.
If you ever want to leave R&D mode you need to go to the location where Origin is installed and delete the EACore.ini file found there.