This chapter analyzes the transformations in the speed of flânerie and its effects on space, based on a study of Jacques Réda’s work. First, I set the historical context and present the work of Jacques Réda. The growth of the biggest cities in Europe, as Paris in France, leads to a global acceleration of every movement. The works of Jacques Réda take place when Paris is growing faster (construction of the beltway, automobile boom…). The flâneur is one of the best witnesses of these changes. Then I study Jacques Réda’s favorite mode of transport, a moped which allows him to reach a moderate pace. In the history of the flânerie, it is something new to consider because the flâneur traditionally uses only his feet. Speediness is one of the cursor the experienced flâneur can play on to improve his specific and sensible mobility. Finally I assess the extension of the space of flânerie. The streets do not give the same message and impression when they are covered rapidly or slower. The adoption of a certain speed allows the flâneur to cover a bigger area so that he can adapt his practice to the new form of the very big cities.