The present invention pertains to a Process for carrying out a high-speed stop in a Fischer-Tropsch process which comprises providing a feed comprising CO and H2 to the inlet section of a fixed bed reactor comprising a Fischer-Tropsch catalyst, the reactor being at reaction temperature and pressure, and withdrawing an effluent from the outlet section of the reactor, wherein the high-speed stop is effected by blocking provision of the CO and H2 to the reactor, and withdrawing gaseous reactor content from the reactor, the gaseous reactor content being withdrawn at least in part from the inlet section of the reactor.