Likely Cause(s)

• Potential hardware issue
• Interference issue
• USB port issue

Symptom(s)

• Typed characters take a few seconds to appear on the screen

Possible solutions

1. Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
2. Move the keyboard closer to the USB receiver. If your receiver is in the back of your computer, it may help to relocate the receiver to a front port. In some cases the receiver signal gets blocked by the computer case, causing a delay. 
3. Keep other electrical wireless devices away from the USB receiver to avoid interferences.
4. Unpair/repair or disconnect/reconnect hardware.
   • If you have a Unifying receiver, identified by this logo,  see Unpair a mouse or keyboard from the Unifying receiver.
   • If your receiver is non-Unifying, it cannot be unpaired. However, if you have a replacement receiver, you can use the Connection Utility software to perform the pairing.
5. Upgrade the firmware for your device if available.
6. Windows only — check if there are any Windows updates running in the background that may cause the delay.
7. Mac only — check if there are any background updates that may cause the delay.
8. Try on a different computer.