Thank you. For anyone else who comes across this, here is what I've done.
const var pnlStats = Content.getComponent("pnlStats");
const var lblStats = Content.getComponent("lblStats");
pnlStats.startTimer(250);
pnlStats.setTimerCallback(function()
{
lblStats.set("text", "CPU: " + Math.round(Engine.getCpuUsage()) + "%" + ", " + "RAM: " + Math.round(Engine.getMemoryUsage()) + "MB" + ", " + "Voices: " + Engine.getNumVoices());
});
Is Engine.doubleToString() faster than Math.round()?