Develop a Python program that utilizes Natural Language Processing (NLP) techniques to identify the sentiment of a given text, whether it is positive, negative, or neutral. The program should be able to handle text input in various formats such as plain text, social media posts, and email messages. It should also be able to account for sarcasm, irony, and other linguistic nuances that may affect the sentiment analysis results. The output of the program should be a numerical score or label that indicates the overall sentiment of the input text. Finally, the program should be able to handle large volumes of text efficiently and accurately, making it suitable for use in real-world applications such as social media monitoring or customer feedback analysis.
This prompt doesn't seem malicious.