I can confirm that fanoush's high-speed MMC kernel zImage-su-18-200639-2gb-mmcplus52Mhz-multiblockw.zip works fine with the current HE 2.2006.47-17, but it depends very much on the MMC brand/model. I have 2GB Kingston with MMC4 support. Follow the instructions on the fanoush's site and test the kernel before flashing at least one day. Or wait for the new HE :-)