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I'm using iMac 21,5.

Since my magic mouse broke, the new one wasn't working properly, it had insane lags, I bought another wireless gaming mouse and it works better but still have lag issues.

I was checking Bluetooth/Mouse settings and it says:

"Keyboard connected.

Mouse not connected."

Pressing mouse to connect, doesn't do anything.

Maybe the problem is there. Please help me.

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    Welcome to Ask Different! There's lots of details missing here like, the mouse you're using, the version of macOS and a better description of "lagging." Remember, we can't look over your shoulder so good descriptions and details are essential. See, How To Ask in our Help Center
    – Allan
    Jul 11 '18 at 22:46
  • Are you sure your mouse battery is completely charged? You might go to system preferences/mouse and check tracking speed.
    – Natsfan
    Jul 12 '18 at 2:16
  • Also, if you experience similar issues with three mice, the problem might actually not be the mouse.
    – nohillside
    Jul 12 '18 at 6:50
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I was having similar trouble with a Logitech bluetooth keyboard and mouse, when I plugged the transponder dongle into the USB port on the back of my iMac. Researching the issue, I found several people suggesting to move the USB dongle away from any USB 3.0 ports, and as an EE I figured it also wouldn't hurt to get it closer to the devices it's talking to. So this is my setup now and I've been a happy camper ever since I bought a USB 2.0 hub, plugged the dongle into that, and moved it near my keyboard and mouse. (Of course the hub is connected to the iMac in the back -- should be obvious, but just sayin.) arrangement of keybd, mouse and usb dongle

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