US stock markets are exhibiting a mixed performance as investors weigh the impact of cooling tensions in the Middle East and insights from Federal Reserve Chair Jerome Powell. The Nasdaq 100 has hit a new all-time high, driven by strong performances in tech stocks, while the S&P 500 hovers close to its record peak. Despite some fluctuations, analysts note buyer fatigue and nervousness beneath the surface, as fresh records loom. Markets are encouraged by reduced geopolitical risks and positive corporate earnings, leading to cautious optimism. Upcoming comments from Powell are highly anticipated, which could influence market sentiment as traders remain vigilant.