BRUSSELS (AFP) - Powerhouse Germany posted its best growth since reunification on Friday, driving Europe past the United States in a four-year record but analysts warned the recovery could be peaking out. The strong performance, bolstered by peers Britain and France, helped stock markets higher in early trade but the optimism faded, with traders cautious after a series of poor US data stoked fears the economy faces growing problems. With 2.2-percent growth between April and June, double forecasts, Germany was playing in a league of its own, according to Brussels-based ING economist Carsten Brzeski. After suffering its worst post-war recession in 2009, we are now experiencing XL growth, German Economy Minister Rainer Bruederle said of the data, the best since reunification in 1990 after a 45-year Cold War division. However, Chris Williamson of London-based Markit economists argued that German manufacturers were winning export sales because concerns about weaker Mediterranean partners were helping to keep the euro down. It remains to be seen if the buoyancy of the eurozones core spills over to the periphery, or whether the periphery drags the core down, Williamson said. Frankfurt-based Commerzbank analyst Christoph Weil agreed that the German growth, routinely described as stellar, was above all driven by rising overseas demand and low interest rates. This speed is unlikely to be sustained, he cautioned. World Bank President Robert Zoellick, speaking in Latvia which endured the EUs deepest recession with a contraction of a whopping 18 percent in 2009, said the very good news from Germany did not mean policymakers could rest easy. Not everyone can export their way out of a crisis, Zoellick said, referring to Germanys trump card. We all have to be alert and anticipate. A 1.0 percent expansion across the 16 eurozone nations, and the 27-member European Union as a whole, was the sharpest in four years, Jennifer McKeown of London-based Capital Economics said. After managing just 0.2 percent in the first quarter, growth beat forecasts and outpaced that of the United States, which posted a quarterly gain of 0.6 percent in the second, down from 0.9 percent between January and March. Amsterdam-based Nick Kounis of ABN AMRO said worries over a double-dip recession now centre on the other side of the Atlantic. Todays picture could be misleading, Kounis said, warning that spending cuts in almost all countries will make for a long and bumpy road while the deepening of Greeces recession is a timely reminder of the underlying problems. Greeces economy shrank 1.5 percent in the second quarter after 0.8 percent in the first, hit by savage cuts agreed with the EU and the International Monetary Fund in exchange for a massive bailout loan. All in all, we think the second quarter marked the peak of the bounce-back, Martin Lueck of Frankfurt-based UBS Investment Research said. Milan-based UniCredit economist Chiara Corsa said he would stick to eurozone growth forecasts of 1.5 percent this year, slipping to 1.3 percent in 2011. On the upside, Britain posted a 1.l percent expansion and France Europes biggest economy after Germany 0.6 percent. Paris now expects growth of 1.4 percent this year, although Oscar Bernal of ING in London also warned of a slowdown there, citing one of the eurozones largest fiscal deficits. Heavyweight struggler Spain, which only escaped recession in the first quarter, saw its economy grow by 0.2 percent, while the Netherlands and Austria each performed strongly with a 0.9 percent gain. The eurozones trade balance also delivered a 2.4-billion-euro June surplus on Friday while US data was mixed again, with 0.4-percent rise for retail sales for July welcomed but below forecasts for a gain of 0.5 percent.