[erlang-questions] why write operation in mnesia is so slow when table fragment is in progress

[devdoer bird]

HI,
I have a  mensia user table ,which carry about 800,000 records .The table is
distributed on 2 nodes  and  4 fragments ,each fragment has 2 replications.
IWhile  new fragment  adding is in progress in one node,the writing
operation  on the other node is very slow. Writing 5 records cost almost 2
mintues. Why is it so slow? How do you guys use mnesia fragment if the write
opertaion is slow?
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