No,not at all.It checks the server every 2 hours but no problem with mine.Uninstall it for a few days to observe the difference but I doubt it's this app.Its footprint is very small.
I mentioned this in your other thread, but I have mine update every 30 minutes, and as long as I'm not doing other things (wifi/bluetooth/sms/emailing) then it's rare for the battery to drop 1% in less than 2-3 hours.