diff --git a/baystation12.dme b/baystation12.dme
index bbe241e371..bcd5c74555 100644
--- a/baystation12.dme
+++ b/baystation12.dme
@@ -126,6 +126,7 @@
 #include "code\datums\ai_laws.dm"
 #include "code\datums\browser.dm"
 #include "code\datums\computerfiles.dm"
+#include "code\datums\crew.dm"
 #include "code\datums\datacore.dm"
 #include "code\datums\datumvars.dm"
 #include "code\datums\disease.dm"
diff --git a/code/datums/crew.dm b/code/datums/crew.dm
new file mode 100644
index 0000000000..d46a83846f
--- /dev/null
+++ b/code/datums/crew.dm
@@ -0,0 +1,74 @@
+var/global/datum/repository/crew/crew_repository = new()
+
+/datum/cache_entry
+	var/timestamp
+	var/data
+
+/datum/repository/crew
+	var/list/cache_data
+
+/datum/repository/crew/New()
+	cache_data = list()
+	..()
+
+/datum/repository/crew/proc/health_data(var/turf/T)
+	var/list/crewmembers = list()
+	if(!T)
+		return crewmembers
+
+	var/z_level = "[T.z]"
+	var/datum/cache_entry/cache_entry = cache_data[z_level]
+	if(!cache_entry)
+		cache_entry = new/datum/cache_entry
+		cache_data[z_level] = cache_entry
+
+	if(world.time < cache_entry.timestamp)
+		return cache_entry.data
+
+	var/tracked = scan()
+	for(var/obj/item/clothing/under/C in tracked)
+		var/turf/pos = get_turf(C)
+		if((C) && (C.has_sensor) && (pos) && (T && pos.z == T.z) && (C.sensor_mode != SUIT_SENSOR_OFF))
+			if(istype(C.loc, /mob/living/carbon/human))
+				var/mob/living/carbon/human/H = C.loc
+				if(H.w_uniform != C)
+					continue
+
+				var/list/crewmemberData = list("dead"=0, "oxy"=-1, "tox"=-1, "fire"=-1, "brute"=-1, "area"="", "x"=-1, "y"=-1, "ref" = "\ref[H]")
+
+				crewmemberData["sensor_type"] = C.sensor_mode
+				crewmemberData["name"] = H.get_authentification_name(if_no_id="Unknown")
+				crewmemberData["rank"] = H.get_authentification_rank(if_no_id="Unknown", if_no_job="No Job")
+				crewmemberData["assignment"] = H.get_assignment(if_no_id="Unknown", if_no_job="No Job")
+
+				if(C.sensor_mode >= SUIT_SENSOR_BINARY)
+					crewmemberData["dead"] = H.stat > UNCONSCIOUS
+
+				if(C.sensor_mode >= SUIT_SENSOR_VITAL)
+					crewmemberData["oxy"] = round(H.getOxyLoss(), 1)
+					crewmemberData["tox"] = round(H.getToxLoss(), 1)
+					crewmemberData["fire"] = round(H.getFireLoss(), 1)
+					crewmemberData["brute"] = round(H.getBruteLoss(), 1)
+
+				if(C.sensor_mode >= SUIT_SENSOR_TRACKING)
+					var/area/A = get_area(H)
+					crewmemberData["area"] = sanitize(A.name)
+					crewmemberData["x"] = pos.x
+					crewmemberData["y"] = pos.y
+
+				crewmembers[++crewmembers.len] = crewmemberData
+
+	crewmembers = sortByKey(crewmembers, "name")
+	cache_entry.timestamp = world.time + 5 SECONDS
+	cache_entry.data = crewmembers
+
+	return crewmembers
+
+/datum/repository/crew/proc/scan()
+	var/list/tracked = list()
+	for(var/mob/living/carbon/human/H in mob_list)
+		if(istype(H.w_uniform, /obj/item/clothing/under))
+			var/obj/item/clothing/under/C = H.w_uniform
+			if (C.has_sensor)
+				tracked |= C
+	return tracked
diff --git a/code/modules/nano/modules/crew_monitor.dm b/code/modules/nano/modules/crew_monitor.dm
index 429ccf4a28..b38ac80515 100644
--- a/code/modules/nano/modules/crew_monitor.dm
+++ b/code/modules/nano/modules/crew_monitor.dm
@@ -1,6 +1,5 @@
 /obj/nano_module/crew_monitor
 	name = "Crew monitor"
-	var/list/tracked = new
 
 /obj/nano_module/crew_monitor/Topic(href, href_list)
 	if(..()) return
@@ -26,51 +25,11 @@
 		return 1
 
 /obj/nano_module/crew_monitor/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/topic_state/state = default_state)
-	user.set_machine(src)
-	src.scan()
-
 	var/data[0]
 	var/turf/T = get_turf(src)
-	var/list/crewmembers = list()
-	for(var/obj/item/clothing/under/C in src.tracked)
-
-		var/turf/pos = get_turf(C)
-
-		if((C) && (C.has_sensor) && (pos) && (T && pos.z == T.z) && (C.sensor_mode != SUIT_SENSOR_OFF))
-			if(istype(C.loc, /mob/living/carbon/human))
-
-				var/mob/living/carbon/human/H = C.loc
-				if(H.w_uniform != C)
-					continue
-
-				var/list/crewmemberData = list("dead"=0, "oxy"=-1, "tox"=-1, "fire"=-1, "brute"=-1, "area"="", "x"=-1, "y"=-1, "ref" = "\ref[H]")
-
-				crewmemberData["sensor_type"] = C.sensor_mode
-				crewmemberData["name"] = H.get_authentification_name(if_no_id="Unknown")
-				crewmemberData["rank"] = H.get_authentification_rank(if_no_id="Unknown", if_no_job="No Job")
-				crewmemberData["assignment"] = H.get_assignment(if_no_id="Unknown", if_no_job="No Job")
-
-				if(C.sensor_mode >= SUIT_SENSOR_BINARY)
-					crewmemberData["dead"] = H.stat > 1
-
-				if(C.sensor_mode >= SUIT_SENSOR_VITAL)
-					crewmemberData["oxy"] = round(H.getOxyLoss(), 1)
-					crewmemberData["tox"] = round(H.getToxLoss(), 1)
-					crewmemberData["fire"] = round(H.getFireLoss(), 1)
-					crewmemberData["brute"] = round(H.getBruteLoss(), 1)
-
-				if(C.sensor_mode >= SUIT_SENSOR_TRACKING)
-					var/area/A = get_area(H)
-					crewmemberData["area"] = sanitize(A.name)
-					crewmemberData["x"] = pos.x
-					crewmemberData["y"] = pos.y
-
-				crewmembers[++crewmembers.len] = crewmemberData
-
-	crewmembers = sortByKey(crewmembers, "name")
 
 	data["isAI"] = user.isMobAI()
-	data["crewmembers"] = crewmembers
+	data["crewmembers"] = crew_repository.health_data(T)
 
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if(!ui)
@@ -87,10 +46,4 @@
 		// should make the UI auto-update; doesn't seem to?
 		ui.set_auto_update(1)
 
-/obj/nano_module/crew_monitor/proc/scan()
-	for(var/mob/living/carbon/human/H in mob_list)
-		if(istype(H.w_uniform, /obj/item/clothing/under))
-			var/obj/item/clothing/under/C = H.w_uniform
-			if (C.has_sensor)
-				tracked |= C
 	return 1