How to fix Bluetooth BT Keyboard Mouse Audio stuttering, delays, interrupts

I just updated my MacBook Pro 13" to the latest i5 model and ran into an annoying problem: the wireless BT mouse (Logitech Laser Travel Mouse M-RCQ142) and keyboard (Apple Aluminium Wireless BT KB) had a terrible delay which rendered both virtually useless. Keystrokes repeatedly 'hang', the mouse pointer was 'jumping'.
I tried virtually everything including a fresh OS X user, unpairing and re-pairing all BT devices, turning off individual BT devices... Nothing helped. Deactivating and reactivating BT resolved the issue ... for perhaps 20 seconds.
The actual problem turned out to be an interference issue between BT and WiFi: I turned off my router and suddenly both the BT keyboard and mouse worked flawlessly. Turning the router back on brought the problems back. I deactivated AirPort from the OS X menu bar and again: no Bluetooth issues.
The solution was fairly simple: I changed the router’s WiFi channel settings (it has two antennas) from 8 (2,447 GHz) and 12 (2,467 GHz) to 1 (2,412 GHz) and 5 (2,432 GHz). Note how subtle the difference in frequency is, yet all problems were immediately gone.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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You may want to try another channel then.
Although intended for AirPort issues, this document about interference may be helpful: AirPort: Potential sources of interference
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