This app was mentioned in 1 comment, with an average of 2.00 upvotes
If you want speed, forget any cloud storage service or apps that use their own servers (e.g pushbullet, email). You'll need direct connection, for example FTP - open ftp connection on your phone via some app or ftp widget, then type something like ftp://192.168.1.101:2121/sdcard in windows explorer (WE has native support for ftp)(you can make a shortcut to that address). or you can go with Bittorent sync.