diff --git a/code/modules/research/machinery/_production.dm b/code/modules/research/machinery/_production.dm
index 5fd5f3fcd35..376f45d5bc1 100644
--- a/code/modules/research/machinery/_production.dm
+++ b/code/modules/research/machinery/_production.dm
@@ -21,8 +21,10 @@
 	var/stripe_color = null
 	///direction we output onto (if 0, on top of us)
 	var/drop_direction = 0
-	//looping sound for printing items
+	///looping sound for printing items
 	var/datum/looping_sound/lathe_print/print_sound
+	///made so we dont call addtimer() 40,000 times in on_techweb_update(). only allows addtimer() to be called on the first update
+	var/techweb_updating = FALSE
 
 /obj/machinery/rnd/production/Initialize(mapload)
 	print_sound = new(src,  FALSE)
@@ -108,6 +110,7 @@
 /// Updates the list of designs this fabricator can print.
 /obj/machinery/rnd/production/proc/update_designs()
 	PROTECTED_PROC(TRUE)
+	techweb_updating = FALSE
 
 	var/previous_design_count = cached_designs.len
 
@@ -130,9 +133,9 @@
 /obj/machinery/rnd/production/proc/on_techweb_update()
 	SIGNAL_HANDLER
 
-	// We're probably going to get more than one update (design) at a time, so batch
-	// them together.
-	addtimer(CALLBACK(src, PROC_REF(update_designs)), 2 SECONDS, TIMER_UNIQUE | TIMER_OVERRIDE)
+	if(!techweb_updating) //so we batch these updates together
+		techweb_updating = TRUE
+		addtimer(CALLBACK(src, PROC_REF(update_designs)), 2 SECONDS)
 
 ///When materials are instered via silo link
 /obj/machinery/rnd/production/proc/silo_material_insert(obj/machinery/rnd/machine, container, obj/item/item_inserted, last_inserted_id, list/mats_consumed, amount_inserted)
diff --git a/code/modules/research/techweb/_techweb.dm b/code/modules/research/techweb/_techweb.dm
index 3da8fe4e1c9..589cdf310e6 100644
--- a/code/modules/research/techweb/_techweb.dm
+++ b/code/modules/research/techweb/_techweb.dm
@@ -149,10 +149,10 @@
 		CHECK_TICK
 		if(get_available_nodes()[i] || get_researched_nodes()[i] || get_visible_nodes()[i])
 			receiver.hidden_nodes -= i //We can see it so let them see it too.
-	for(var/i in researched_nodes)
+	for(var/i in researched_nodes - receiver.researched_nodes)
 		CHECK_TICK
 		receiver.research_node_id(i, TRUE, FALSE, FALSE)
-	for(var/i in researched_designs)
+	for(var/i in researched_designs - receiver.researched_designs)
 		CHECK_TICK
 		receiver.add_design_by_id(i)
 	receiver.recalculate_nodes()
@@ -486,7 +486,7 @@
 		return
 	if(researched)
 		researched_nodes[node.id] = TRUE
-		for(var/id in node.design_ids)
+		for(var/id in node.design_ids - researched_designs)
 			add_design(SSresearch.techweb_design_by_id(id))
 	else
 		if(available)