Disconnect from WiFi Button in Yosemite (Faster File Transfers via Airdrop)

Question

Hi all! Just thought I'd share a great new pro-tip I found that's pretty handy.
Sometimes file transfers through a complex or busy network with a  (think hotel lobby or coffee shop), Airdrop file transfers can run extremely slow vs. it going from computer to computer via no network (Ad Hoc). I was determined to find a work around for disconnecting from a WiFi network without turning off Wifi.
Anyways, Yosemite introduced a much asked for feature - The disconnect from WiFi button! Just hold down option while you select the WiFi indicator on the menu bar and click disconnect! Your WiFi will continue to be on and it simply won't connect to that network again. If you now search for other computers in AirDrop, it will find them and be a much faster computer to computer connection.

Answer 1

Testing in a new User will quickly tell you if the problem is system wide or if it's your User's folder that contains the problem.
CREATE A NEW USER
Go to System Preferences --> Create a New User in Users & Groups Switch to the New User by logging out/in or use Fast User Switching.
Enter your Apple ID and password.
Test Markup in Mail using the iCloud account.
Continue testing to see what works in the new User.
Do you still see the issue?
    If yes, then the problem is with your base files.
    If no, then the problem is in your User's folder.
Finder - my iMac name is - iMacs iMac. All of a sudden it become iMacs iMac (2) and latter iMacs iMac (6). What are these numbers ?
In System Preferences > Sharing you can see name. When Finder adds a number it indicates it's seeing another drive with the same name. You can select to rename but this could also be an indication of issues at the base level.
Do you have an external drive that could be used to clone your drive in case you need to do a clean install?