A Time-Of-Flight (TOF) spectrometer for measurement of the 2.5MeV neutron emission from fusion plasmas has been developed and put into use at the JET tokamak. It has been Optimized for peration at high Rates (TOFOR) for the purpose of performing advanced Neutron Emission Spectroscopy (NES) diagnosis of deuterium plasmas with a focus on the fuel ion motional states for different auxiliary heating scenarios. This requires operation over a large dynamic range including high rates of >100kHz with a maximum value of 0.5MHz for the TOFOR design. This paper describes the design principles and their technical realization. The performance is illustrated with recent neutron time-of-flight spectra recorded for plasmas subjected to different heating scenarios. A data acquisition rate of 39kHz has been achieved at about a tenth of the expected neutron yield limit of JET, giving a projected maximum of 400kHz at peak JET plasma yield. This means that the count rate capability for NES diagnosis of D plasmas has been improved more than an order of magnitude. Another important performance factor is the spectrometer bandwidth where data have been acquired and analyzed successfully with a response function for neutrons over the energy range 1 to >5MeV. The implications of instrumental advancement represented by TOFOR are discussed.