Use spritesheets to reduce time spent sending PNG assets by 90+%

code/modules/research/designs.dm

@@ -51,8 +51,9 @@ other types of metals and chemistry for reagents).
 	return ..()
 
 /datum/design/proc/icon_html(client/user)
-	send_asset(user, "design_[id].png", FALSE)
-	return "<img class='icon' src=\"design_[id].png\">"
+	var/datum/asset/spritesheet/sheet = get_asset_datum(/datum/asset/spritesheet/research_designs)
+	sheet.send(user)
+	return sheet.icon_tag(id)
 
 ////////////////////////////////////////
 //Disks for transporting design datums//

code/modules/research/rdconsole.dm

@@ -217,6 +217,8 @@ doesn't have toxins access.
 
 /obj/machinery/computer/rdconsole/proc/ui_header()
 	var/list/l = list()
+	var/datum/asset/spritesheet/sheet = get_asset_datum(/datum/asset/spritesheet/research_designs)
+	l += "[sheet.css_tag()][RDSCREEN_NOBREAK]"
 	l += "<div class='statusDisplay'><b>[stored_research.organization] Research and Development Network</b>"
 	l += "Available points: [round(stored_research.research_points)] (+[round(stored_research.last_bitcoins * 60)] / minute)"
 	l += "Security protocols: [obj_flags & EMAGGED ? "<font color='red'>Disabled</font>" : "<font color='green'>Enabled</font>"]"