To grind as fast as possible, you'll want to set your party up so the person who will make the attack goes first, and you'll want to keep sirens in the upper left corner of your inventory, so you don't have to move to select them in your item menu. You can also make great use of Artemis arrows with this grind, since your last arrow won't be up during it as long as you're one-shotting the dragons.

Early in a run, making use of a Coffin, Hourglass, or the Stop spell can get help get the first egg down. If Palom only has Virus, you might need to Bluff once or twice to be able to one-shot the egg, depending on his equipment. Do not trust that an unbluffed Virus cast will kill the egg, even though it's possible.

Yellow dragons tend to be the fastest xp per minute, assuming you can one-shot them. The relative ease/speed you can start a grind also makes this an excellent choice for doing a small grind at various points in the game to get you a leg up on your next checks. Getting a Palom to Quake (2 eggs with no other xp sources/xp bonus), or either Rosa or Porom to Bersk/Blink are really common quick grinds. Depending on your path to the underworld, doing 2-3 eggs should give you the levels to take on Dwarf Castle or the top of Lower Bab-il, and makes all the overworld checks, minus the Odin spot, trivial.

With an RA1 character acting first, use a MuteBell or the mute spell to prevent the Warlocks from casting. Then attack with/berserk a melee character with a mage killing weapon (Rune axe, mute knife, mute arrow, Elven Bow).

Since the Mute status will still be applied after a Life2, this can be a very nice slingshot grind. Alternatively, if you don't berserk your attacker, you can often get multiple life potion tosses with enemy attack buffers, or by timing a Jump well.

Warlocks are also susceptible to instant death attacks and stop. Coffins are a great way to get started with the grind. Hourglasses are okay, but will still allow the Warlocks to get three Fire 2 casts off, so you'd be facing a decent amount of damage per fight.

Toss an hourglass as your first action, and if your party has members who will likely die from either a physical attack or the Blitz ability of the dragons, you can pause to see if you need to resurrect anyone before continuing on. Berserking a character with dragon killing weaponry, preferably Kain with a Dragoon Spear, or anyone with a decent bow and Artemis Arrows.

Put your weak caster in the center, to make sure they get the bonus accuracy from that slot (this is _very_ important with Tellah, since a poorly timed miss can wreck your day). Kill both of the Beamers, and then hit the Searcher with an attack, preferably one that does not deal much damage, and then cast Weak on the summoned D Machine.

This is a great grind when you have a fairly early Darkness Crystal, access to the Weak spell, and a way to both keep your Weak caster's MP up, as well as heal effectively.

Have a fast/fastish agility anchor. Certainly take off a cursed ring. Blink up and berserk your strongest hitter. Reflect Nukes.

* also findable in random encounters and 3 trapped chests in the LST/Lunar Core

Cast a single-target Lit1 spell on a Grenade, which will cause it's script to use Reaction to kill itself and all other enemies in the fight. Because of how multi-targeting works in FFIV, you can't use a Thorrage or a multicast Lit spell to accomplish this. You cannot use an hourglass to (xp comes from two different enemy packs. Juclyote x2, Moon Cell x2, Grenade is worth 23650, and Grenade x2, Balloon x2 is worth 9960)