[all variants] Slow transfer on wireless LAN

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http://ubuntuforums.org – Wireless LAN with a very slow transfer (rsync, scp) between the computers on that local network. Max. speed at 1.5 MByte/s. The router is D-Link DIR-615, with firmware DD-WRT v24-sp2 (06/14/11) std. The computers on the network are all with Xubuntu 11.10. Any idea how to make the transfer between them faster? (Hardware)