Try these steps in order:
- Turn off Filter keys first. This setting can make keys respond only after being held longer.
- Press Windows key + U
- Go to Accessibility > Keyboard
- Turn Filter keys Off
- Test with the On-Screen Keyboard.
- Press Windows key + Ctrl + O
- Type with it and check whether the delay still happens
- If the On-Screen Keyboard works normally, the external keyboard is more likely the problem
- Check the keyboard connection.
- Unplug the keyboard USB cable
- Wait a short time, then plug it back in
- Try a different USB port on the Acer PC
- If the keyboard is connected through a USB hub, remove the hub and connect it directly to the PC
- Check the keyboard itself.
- Make sure the cable is not damaged
- Clean around the affected keys
- If it is battery-powered, replace or recharge the batteries
- If it is a wireless keyboard:
- Check for a Reset button on the keyboard or USB receiver
- If it uses a USB receiver, unplug the receiver for about 10 seconds, then plug it back in
- If it uses Bluetooth, reconnect it from Start > Bluetooth & devices
- Test the keyboard on another PC, or test another keyboard on the Acer PC.
- If this keyboard also fails on another PC, it is likely a hardware problem
- If another keyboard works fine on the Acer PC, that also points to the external keyboard being faulty
- If the keyboard is slow but still works sometimes:
- Close open apps
- Restart the PC
- Check for Windows updates from Start > Settings > Update & Security > Windows Update
If the main problem is that keys must be held down before they type, Filter keys being turned on is the first setting to check.
References: