I've noticed that after queuing a sizable amount of data, there is a noticeable delay (e.g. 1 or 2s) between initiating the startBackground function and it returning.
Doing some tests, it looks like the data output is actually starting nearer when the function is returning than when it is initiated.
Without modifying hardware, is there a way to get better control of exactly when the data output is initiating? Or, at least to get back a time of when it actually did initiate?
(I should add, maybe when startBackground returns is actually a good indication of when data output started - I just couldn't find this actually written anywhere)