diff --git a/code/controllers/subsystems/nanoui.dm b/code/controllers/subsystems/nanoui.dm
index c31449addc..7512ad872e 100644
--- a/code/controllers/subsystems/nanoui.dm
+++ b/code/controllers/subsystems/nanoui.dm
@@ -1,6 +1,6 @@
 SUBSYSTEM_DEF(nanoui)
 	name = "NanoUI"
-	wait = 20
+	wait = 5
 	// a list of current open /nanoui UIs, grouped by src_object and ui_key
 	var/list/open_uis = list()
 	// a list of current open /nanoui UIs, not grouped, for use in processing
@@ -23,6 +23,8 @@ SUBSYSTEM_DEF(nanoui)
 			if(copytext(filename, length(filename)) != "/") // filenames which end in "/" are actually directories, which we want to ignore
 				if(fexists(path + filename))
 					asset_files.Add(fcopy_rsc(path + filename)) // add this file to asset_files for sending to clients when they connect
+	for(var/i in GLOB.clients)
+		addtimer(CALLBACK(src, .proc/send_resources, i), 10)
 	return ..()
 
 /datum/controller/subsystem/nanoui/Recover()
@@ -40,3 +42,10 @@ SUBSYSTEM_DEF(nanoui)
 	for(var/thing in processing_uis)
 		var/datum/nanoui/UI = thing
 		UI.process()
+
+//Sends asset files to a client, called on client/New()
+/datum/controller/subsystem/nanoui/proc/send_resources(client)
+	if(!subsystem_initialized)
+		return
+	for(var/file in asset_files)
+		client << browse_rsc(file)	// send the file to the client
\ No newline at end of file
diff --git a/code/controllers/subsystems/processing/chemistry.dm b/code/controllers/subsystems/processing/chemistry.dm
index 67b74d3ab6..34094f9fe3 100644
--- a/code/controllers/subsystems/processing/chemistry.dm
+++ b/code/controllers/subsystems/processing/chemistry.dm
@@ -4,6 +4,7 @@ PROCESSING_SUBSYSTEM_DEF(chemistry)
 	flags = SS_BACKGROUND|SS_POST_FIRE_TIMING
 	init_order = INIT_ORDER_CHEMISTRY
 	var/list/chemical_reactions = list()
+	var/list/chemical_reactions_by_reagent = list()
 	var/list/chemical_reagents = list()
 
 /datum/controller/subsystem/processing/chemistry/Recover()
@@ -22,15 +23,16 @@ PROCESSING_SUBSYSTEM_DEF(chemistry)
 // more than one chemical it will still only appear in only one of the sublists.
 /datum/controller/subsystem/processing/chemistry/proc/initialize_chemical_reactions()
 	var/paths = typesof(/datum/chemical_reaction) - /datum/chemical_reaction
-	SSchemistry.chemical_reactions = list()
+	chemical_reactions = list()
+	chemical_reactions_by_reagent = list()
 
 	for(var/path in paths)
-		var/datum/chemical_reaction/D = new path()
+		var/datum/chemical_reaction/D = new path
+		chemical_reactions += D
 		if(D.required_reagents && D.required_reagents.len)
 			var/reagent_id = D.required_reagents[1]
-			if(!chemical_reactions[reagent_id])
-				chemical_reactions[reagent_id] = list()
-			chemical_reactions[reagent_id] += D
+			LAZYINITLIST(chemical_reactions_by_reagent[reagent_id])
+			chemical_reactions_by_reagent[reagent_id] += D
 
 //Chemical Reagents - Initialises all /datum/reagent into a list indexed by reagent id
 /datum/controller/subsystem/processing/chemistry/proc/initialize_chemical_reagents()
diff --git a/code/modules/nano/nanomanager.dm b/code/modules/nano/nanomanager.dm
index afa779895a..69b0e7b77e 100644
--- a/code/modules/nano/nanomanager.dm
+++ b/code/modules/nano/nanomanager.dm
@@ -221,18 +221,4 @@
 
 	oldMob.open_uis.Cut()
 
-	return 1 // success
-
- /**
-  * Sends all nano assets to the client
-  * This is called on user login
-  *
-  * @param client /client The user's client
-  *
-  * @return nothing
-  */
-
-/datum/controller/subsystem/nanoui/proc/send_resources(client)
-	for(var/file in asset_files)
-		client << browse_rsc(file)	// send the file to the client
-
+	return 1 // success
\ No newline at end of file
diff --git a/code/modules/reagents/Chemistry-Holder.dm b/code/modules/reagents/Chemistry-Holder.dm
index 2d906381d1..7a39bfcb32 100644
--- a/code/modules/reagents/Chemistry-Holder.dm
+++ b/code/modules/reagents/Chemistry-Holder.dm
@@ -77,41 +77,31 @@
 	return
 
 /datum/reagents/proc/handle_reactions()
-	START_PROCESSING(SSchemistry, src)
-
-//returns 1 if the holder should continue reactiong, 0 otherwise.
-/datum/reagents/process()
-	if(QDELETED(my_atom))		//No container, no reaction.
-		return PROCESS_KILL
-	if(my_atom.flags & NOREACT) // No reactions here
-		return PROCESS_KILL
-
-	var/reaction_occured
-	var/list/effect_reactions = list()
+	if(QDELETED(my_atom))
+		return FALSE
+	if(my_atom.flags & NOREACT)
+		return FALSE
+	var/reaction_occurred
 	var/list/eligible_reactions = list()
-	for(var/i in 1 to PROCESS_REACTION_ITER)
-		reaction_occured = 0
+	var/list/effect_reactions = list()
+	do
+		reaction_occurred = FALSE
+		for(var/i in reagent_list)
+			var/datum/reagent/R = i
+			eligible_reactions |= SSchemistry.chemical_reactions_by_reagent[R.id]
 
-		//need to rebuild this to account for chain reactions
-		for(var/datum/reagent/R in reagent_list)
-			eligible_reactions |= SSchemistry.chemical_reactions[R.id]
-
-		for(var/datum/chemical_reaction/C in eligible_reactions)
+		for(var/i in eligible_reactions)
+			var/datum/chemical_reaction/C = i
 			if(C.can_happen(src) && C.process(src))
 				effect_reactions |= C
-				reaction_occured = 1
 
-		eligible_reactions.Cut()
-
-		if(!reaction_occured)
-			break
-
-	for(var/datum/chemical_reaction/C in effect_reactions)
+				reaction_occurred = TRUE
+		eligible_reactions.len = 0
+	while(reaction_occurred)
+	for(var/i in effect_reactions)
+		var/datum/chemical_reaction/C = i
 		C.post_reaction(src)
-
 	update_total()
-	if(!reaction_occured)
-		return PROCESS_KILL
 
 /* Holder-to-chemical */