Press your lips together to stop the air, then release. No vocal cord vibration.

Americans pronounce performs as per-FORMZ (/pərˈfɔrmz/). Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "She performs in a local improv troupe on weekends".
Record yourself saying "performs" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 6 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.

Start with the 'aw' jaw drop and rounded lips. Pull the tongue back and up while keeping the lips rounded for the R.
Press your lips together. Air flows through your nose. Vocal cords vibrate.

Same position as S, but add vocal cord vibration. Feel the buzz.

The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the second syllable, not the others. Stretch FORMZ — keep everything else short and quick.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.