From FreeSpace Wiki
The Shivan Megafunk Turret is a primary weapon used in turrets of the large vessels.
Basic Shivan turret weapon.
|| 1440 m
| Rate of Fire
||0.29 shots per second
| Base Damage
| Armor Damage
| Shield Damage
|| Very Poor
| Subsystem Damage
This is the most powerful turret laser in either game. It does almost enough damage a second to be considered a serious weapon, but not enough; especially considering its placid 120 mps speed. Even so, do not attack a Shivan Megafunk Turret if your shields are damaged. If the shot goes through it could seriously mess with your fighter / bomber.
The best blob turret in the game, but that doesn't say much considering how weak all blob turrets are.
If there's a gap in your shields and you're unlucky enough to be hit by this thing, it will rape you. However, the blobs move so ridiculously slow that a GTF Apollo can outrun them on afterburners. Nevertheless, the Megafunk Turret is well suited to be used against enemy warships.
ROF isn't all that bad, but that doesn't make up for its painfully slow speed.