Hi KKhaos1,
the store streams not while you play. The store is only active if you bot and have an active HB session running.
It checks upon startup which products are active on your account and streams them to your HB client so that you can select and use them.
To make sure all products are uptodate this happens everytime you start the client.
With a "normal" internet connection you should not notice any difference.
Does this answer your question?
Regards
BotOp