I timed last night the time it took from the alarm to full submersion with and without the deck gun. Without the deckgun was about 0.5-0.7 faster, barely noticeable. No idea on the underwater performance, batteries are one of the items I always upgrade so never seem to run out of battery power, usually air will run out first.
Flak guns are only really good to shoot down the first wave of planes so they don't keep straffing you. Once you've cleared the skies you really need to dive and change course, there's a 100% chance that more planes will be sent to your last position to hunt you down. Once the double twin 2 cm guns are available they can put up an enormous amount of flak to give you a decent chance to take out the planes before they get a chance to dive bomb you.
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