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reboot is slow


hi

i have rebuilt redboot successfully (RAM and ROM versions), every thing works fine but slow, very slow. the board is ap48 (a ubnt nanostation 5, which i like to customize), it has a stock redboot wich runs much faster than what i have built !!!
for example pinging the board (running stock redboot) replys in about 4 ms average while pinging with my redboot is about 30 ms.
decompressing a lzma image takes forever (10+ minutes) !!! the stock redboot decompresses it under 5 seconds. running from ram or flash dose not make that deference. loading files from tftp also very slow about 10 kBps


i took the code and patches from dd-wrt microredboot

more info about the broard:
cpu: mips 4kc 180 MHz
rom: 4 MB
ram: 16 MB

what can i do to figure out the root of the problem??? any help is appreciated.

thanks in advance
regards

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