For those who are stupid: The Ion Cannon explosion's lag depends on how many bricks you blow up. The "lag" the Mini-nuke and the Ion Cannon were known for was from the amount of bricks it would fake kill all at once. A problem easily stopped by not having brick damage on.
The only reason both were failed was because they overwrote default functions. The Ion Cannon overwrote all projectile hit sounds, and the Mini-nuke overwrote the Rocket Launcher's projectile damage.
On topic: For the sake of idiots who may use it, they explosion radius would have to be lowed or set up to not break bricks.