The educational computer system of Niigata university was replaced on January 2007 where diskless network boot terminals based on preboot excution environment (PXE) boot are introduced for the educational computers. However, the terminals boots much slower than the local boot termials which boot from local HDD. We tuned the network wiring and the settings of the network boot terminals and add new boot servers to boot the terminals faster. It is very diecult to nd suitble parameters aecting boot-up time of the network boot terminals because the parameters are diernet from that in the local boot terminals. To nd the factors for faster boot of the terminals,we measured the boot-up time of the terminals by changing network bandwidthes, HDD drives of the boot servers and boot cache. We nd the bandwidth of the network strongly aects the boot-up time. On the other hand, the boot-up time do not seriously changed by replacing the HDD and boot cache. In this paper, we describe the details of the result of our experiment.