Performance of jdbc insert statements and select nextval

[ralf(dot)baumhof(at)bgs-ag(dot)de]

i found the following problem:

10000 inserts with pgadmin tool into one table (primary key bigserial) can 
be done wihtin 3 seconds. If i perform the same job with jdbc this takes 
13 seconds. The insert statement is prepared only once, the statement for 
fetching the nextval also. If i omit the select nextval execution time 
improves to 8 seconds. Can anybody tell me why jdbc is  3 to four times 
slower than pgadmin? I am using Postgresql 8.2 and 8.3 Database server, 
java 1.5 and 1.6 and i tried the drivers 8.2 and 8.3 in type 3 and type 4. 
The execution times are always identical. 

thanks, Ralf
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