Don't slow down your screenplay by writing dialogue that is filled with directions. Avoid adjectives and adverbs like (happily), (sadly), (angrily), (fearfully), except when there is uncertainty of your intention. Otherwise, let the director or actor decide how to say their lines. Don't play director and try to tell the actor how to say a line of dialogue. It is an insult to the professional actor and a sure sign that you're a novice.
The shorter your dialogue the better. Use short speeches and crisp dialogue. Pace your short speeches with longer speeches. Use interruptions and pauses interspersed throughout your dialogue. The biggest mistake beginning screenwriters make is having the characters give long-winded speeches that end up sounding like monologues.
Silence can be more impactful and emotional than extensive dialogue and explanations. In real life we communicate nonverbally much more than we use verbal communication. Keep in mind when writing dialogue your character's tone of voice, facial expression, and eye contact. Close your eyes and visualize what emotion you want your character to express before you write the dialogue.
Instead of using words, try to communicate your character's feelings through a gesture, facial expression, or body movement. Use these actions in place of dialogue.
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