Stock futures have dipped following record highs for the Dow and S&P 500 as optimism from China's sweeping stimulus measures continues to impact global markets. Recent reports indicate that the S&P 500 and Dow achieved fresh records, buoyed by a rally in Asian shares driven by China's economic support efforts. The People's Bank of China has introduced a substantial monetary easing package, cutting interest rates and mortgage down payments in a bid to revive the ailing economy. Analysts cautiously view this stimulus as potentially beneficial but suggest that more aggressive measures may be necessary for sustained growth. Meanwhile, sectors such as technology and materials have seen significant rises, particularly with the notable surge of stocks like Nvidia. Overall, these developments highlight a mixed sentiment in the markets, with investors weighing the immediate positive impacts of China's measures against potential long-term economic challenges.