>plus adding the time it takes to open any views that are related to the comboboxes.

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What do you mean with that?
I tested it as follows.
I made a form with a combo on it
I created a test program to clear up the environment
then get the time
then start the form
then get the time
and print the difference.

After that i did the same thing with a table in the dataenvironment and in the rowsource.

Then with a view in the dataenvironment and in the rowsource.

and at least with nothing in the dataenvironment and a sql string in the rowsource.

All this i run several times to have a good avarage value.
form all the values i substracted the time to run the form with nothing in the DE and in the rowsource.
So opening views and so is included in the time measured.