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The CPU pill button in the header opens a popup menu for managing FOAM’s CPU usage. It controls two things at once: a bubbles-per-second governor (a hard ceiling on density) and a worker thread count (how many CPU cores FOAM uses for voice rendering).

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Performance Modes

The thread count for each mode is detected from your CPU and shown in the menu.

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Bubbles-per-Second Governor

In addition to the threading mode, the menu shows the current bubbles-per-second cap. FOAM will smoothly throttle density above this threshold to prevent runaway CPU spikes — the cap protects you from setting Rate too high in combination with high Cascade values. You can also set a custom value from the menu.

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Other CPU Tips

  • Reduce Rate — fewer bubbles per second means less CPU
  • Reduce Topology — foam physics simulation is CPU-intensive
  • Lower Cascade — chain reactions multiply bubble count exponentially
  • Choose a less complex Resonator preset, or set Resonance amount to 0% if you don’t need it