Makes the tarantula move delay a movement speed modifier

code/__DEFINES/movespeed_modification.dm

@@ -25,6 +25,8 @@
 
 #define MOVESPEED_ID_SLIME_STATUS						"SLIME_STATUS"
 
+#define MOVESPEED_ID_TARANTULA_WEB						"TARANTULA_WEB"
+
 #define MOVESPEED_ID_LIVING_TURF_SPEEDMOD				"LIVING_TURF_SPEEDMOD"
 
 #define MOVESPEED_ID_CARBON_SOFTCRIT					"CARBON_SOFTCRIT"
@@ -61,4 +63,4 @@
 #define MOVESPEED_ID_SLAUGHTER                          "SLAUGHTER"
 #define MOVESPEED_ID_DIE_OF_FATE                        "DIE_OF_FATE"
 
-#define MOVESPEED_ID_SHOVE "SHOVE"
+#define MOVESPEED_ID_SHOVE 								"SHOVE"

code/modules/mob/living/simple_animal/hostile/giant_spider.dm

@@ -177,14 +177,17 @@
 	status_flags = NONE
 	mob_size = MOB_SIZE_LARGE
 	gold_core_spawnable = NO_SPAWN
+	var/slowed_by_webs = FALSE
 
-/mob/living/simple_animal/hostile/poison/giant_spider/tarantula/movement_delay()
-	var/turf/T = get_turf(src)
-	if(locate(/obj/structure/spider/stickyweb) in T)
-		speed = 2
-	else
-		speed = 7
+/mob/living/simple_animal/hostile/poison/giant_spider/tarantula/Moved(atom/oldloc, dir)
 	. = ..()
+	if(slowed_by_webs)
+		if(!(locate(/obj/structure/spider/stickyweb) in loc))
+			remove_movespeed_modifier(MOVESPEED_ID_TARANTULA_WEB)
+			slowed_by_webs = FALSE
+	else if(locate(/obj/structure/spider/stickyweb) in loc)
+		add_movespeed_modifier(MOVESPEED_ID_TARANTULA_WEB, priority=100, multiplicative_slowdown=3)
+		slowed_by_webs = TRUE
 
 //midwives are the queen of the spiders, can send messages to all them and web faster. That rare round where you get a queen spider and turn your 'for honor' players into 'r6siege' players will be a fun one.
 /mob/living/simple_animal/hostile/poison/giant_spider/nurse/midwife