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There are multiple ways to address the issue of slow communication between a PC and Arduino through a serial port when response time is significantly delayed:

1. Changing the Baud Rate: The Baud rate is the number of bits per second transferred between the PC and Arduino. Changing the Baud Rate to a higher value could significantly improve the communication speed. However, the Baud Rate should match between the PC and Arduino.

2. Buffer Size: Increasing the buffer size on the Arduino could help in a faster transfer of data between the PC and the device.

3. Check the Code: Ensure that your code is optimized and doesn't involve a lot of unnecessary delay or long loops.

4. Use hardware flow control: Hardware flow control signals the Arduino that it should not transmit data until it receives an approval signal from the PC. This could prevent the buffer on the Arduino from overflowing.

5. Use a USB to Serial Adapter: Using a USB to Serial Adapter provides dedicated hardware for serial communication and could improve the communication speed.

6. Check USB Port: Ensure that the USB port used is 2.0 or higher as the 1.x version has lower data transfer rates.

7. Shield the Arduino: Due to its open-source nature, Arduino is sensitive to electromagnetic interference. Any electromagnetic interference could significantly delay the communication process. Using shields or wrapping the device in foil could prevent this issue.

By implementing the above measures, the slow communication between a PC and Arduino through a serial port when there is a significant delay in response time could be addressed.