Monster Respawn Timer

After killing any monster, there will be a respawn time of 3 seconds before the next monster appears. During this time the player cannot deal damage, and therefore cannot gain XP. This means that a monster respawning can be considered a guaranteed miss (or two). Respawn time is capped at 0.25s.

Sources

The Unhallowed Wasteland effect can be doubled if the player has Carthulu
Solar Eclipse provides -1s Monster Respawn Timer while using Normal Damage

Source	Type	DLC	Monster Respawn Timer	Other Modifiers
Error creating thumbnail: File missing Frozen Maze	Agility Obstacle 11		-0.1s Monster Respawn Timer	+1% Damage Reduction -3 Prayer Point Cost for Prayers -20% Rune Preservation -20% Ammo Preservation
Error creating thumbnail: File missing Pillar of Combat	Agility Pillar		-0.2s Monster Respawn Timer	+10% Ranged Evasion +5% Flat Slayer Area Effect Negation +10 Flat HP Regen +10% Magic Evasion +5% of Maximum Hit added to Minimum Hit +10% Melee Evasion
Candle Lamp (Lit)	Item (Consumable)		-0.2s Monster Respawn Timer	+4% Attack Skill XP +4% Strength Skill XP +4% Defence Skill XP +4% Hitpoints Skill XP +4% Ranged Skill XP +4% Magic Skill XP +4% Slayer Skill XP +4% Prayer Skill XP -4% Alt. Magic Skill XP +25 GP gained when hitting with an attack
Error creating thumbnail: File missing Crimson Lantern Stick	Item (Shield, Passive)	Error creating thumbnail: File missing	-0.2s Monster Respawn Timer	+50 AP from Monster drops +4% Corruption Abyssal XP
Error creating thumbnail: File missing Enhanced Township Food Scroll	Item (Consumable)	Error creating thumbnail: File missing	-0.2s Monster Respawn Timer	+3% Fishing Abyssal XP +5% Chance to gain +1 additional resource in Cooking (Cannot be doubled) -10% damage taken from dragonbreath +3% Fishing Skill XP
Hunters Hat	Item (Helmet, Passive)		-0.2s Monster Respawn Timer
Harold	Pet		-0.2s Monster Respawn Timer	+5% Accuracy Rating +5% Global Evasion +3% Chance to preserve Summoning Charges -0.1s Attack Interval +3% Chance To Preserve Potion Charge +5% Global GP (except Item Sales) +5% Global Slayer Coins (except Item Sales) +5% Mastery XP in all Skills +50% Mastery Pool XP Cap +2% of Maximum Hit added to Minimum Hit -2% Interval for all Non-Combat Skills +3% Ammo Preservation +3% Rune Preservation +2% Chance to Double Items Globally
Unhallowed Wasteland	Point of Interest		-0.25s Monster Respawn Timer	-100% GP from Combat -100% Chance To Double Loot in Combat
Error creating thumbnail: File missing Lava Jump	Agility Obstacle 9		-0.3s Monster Respawn Timer	-6% Damage Reduction -6% Auto Eat Efficiency -6% Mastery XP in all Skills
Error creating thumbnail: File missing Dragon Fight	Agility Obstacle 10		-0.3s Monster Respawn Timer	-16% Auto Eat Efficiency
Slayer Relic 4	Ancient Relic		-0.3s Monster Respawn Timer
Summoning Lesser Relic	Item (Consumable)		-0.3s Monster Respawn Timer	-5% Summoning Interval +15 base primary resource quantity gained in Summoning