First of all, "Help" is not a very descriptive subject line for a newsgroup
post. Try to convey some meaningful content such as "Data Access taking a
long time after publish"

At this point all we know is that you are using a dll (an assembly?) for
your data access, and that it is taking a long time after you publish your
app vs. using it locally  (in the Visual Studio IDE in debug mode, perhaps?)

Have you tried turning on Page tracing so you can see where the hangup is?
Have you got <compilation debug="false"... set? You really need to provide
more information if you want help.

-- Peter
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As Peter said, this isn't a lot to work with but you might try writing 10-20
lines of code which just connects to your data store and dumps the data into
a page .. use one of the queries from your app

If that still takes 40-45 seconds you have some isolation of the problem;
maybe you have an index on a local table that you forgot to put on the
remote table ... that would be enough to cause your problem ... as would
many other things

Could be almost anything - give us a clue...