Investing champion David Ryan suggests that Tesla's strong performance might be slowing down, pointing out that the company's stock had made three significant moves since June 21, but the latest move occurred in lower trading volume, followed by a pullback with higher-than-average volume. Portfolio manager Irusha Peiris sold a portion of his Tesla stock when it fell below the 21-day line, expressing disappointment in its performance. After Tesla reported its earnings, the company's shares experienced a sharp drop of nearly 10%, causing it to lose around $90 billion in market capitalization.