Optmizes handle_mutations_and_radiation

Saving about 90% CPU power on blank humanoids

code/modules/mob/living/carbon/human/life.dm

@@ -170,11 +170,10 @@
 					emote("drool")
 
 /mob/living/carbon/human/handle_mutations_and_radiation()
-	for(var/datum/mutation/mutation in GLOB.dna_mutations)
-		if(!mutation.block)
-			continue
-		if(mutation.is_active(src))
-			mutation.on_life(src)
+	for(var/mutation_type in active_mutations)
+		var/datum/mutation/mutation = GLOB.dna_mutations[mutation_type]
+		mutation.on_life(src)
+
 	if(!ignore_gene_stability && gene_stability < GENETIC_DAMAGE_STAGE_1)
 		var/instability = DEFAULT_GENE_STABILITY - gene_stability
 		if(prob(instability * 0.1))

code/modules/mob/living/carbon/human/say.dm

@@ -152,11 +152,9 @@
 				verb = pick("whinnies", "neighs", "says")
 
 		if(dna)
-			for(var/datum/mutation/mutation in GLOB.dna_mutations)
-				if(!mutation.block)
-					continue
-				if(mutation.is_active(src))
-					S.message = mutation.on_say(src, S.message)
+			for(var/mutation_type in active_mutations)
+				var/datum/mutation/mutation = GLOB.dna_mutations[mutation_type]
+				S.message = mutation.on_say(src, S.message)
 
 		var/braindam = getBrainLoss()
 		if(braindam >= 60)

code/modules/mob/living/carbon/human/update_icons.dm

@@ -450,14 +450,13 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 	if(gender == FEMALE)
 		g = "f"
 	// DNA2 - Drawing underlays.
-	for(var/datum/mutation/mutation in GLOB.dna_mutations)
-		if(!mutation.block)
-			continue
-		if(mutation.is_active(src))
-			var/underlay = mutation.on_draw_underlays(src, g)
-			if(underlay)
-				standing.underlays += underlay
-				add_image = 1
+	for(var/mutation_type in active_mutations)
+		var/datum/mutation/mutation = GLOB.dna_mutations[mutation_type]
+		var/underlay = mutation.on_draw_underlays(src, g)
+		if(underlay)
+			standing.underlays += underlay
+			add_image = TRUE
+
 	if(HAS_TRAIT(src, TRAIT_LASEREYES))
 		standing.overlays += "lasereyes_s"
 		add_image = 1

code/modules/mob/mob_defines.dm

@@ -174,6 +174,7 @@
 
 	var/stance_damage = 0 //Whether this mob's ability to stand has been affected
 
+	/// List of the active mutation types
 	var/list/active_mutations = list()
 
 	var/last_movement = -100 // Last world.time the mob actually moved of its own accord.