Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: #ADP's #ezlabor web portal has to be THE SLOWEST web app I have ever had the displeasure of using!!
This tweet contains emotions: 
anger, disgust, sadness