Use fewer particlespawners for portals

To increase performance

mods/ITEMS/mcl_portals/portal_nether.lua

@@ -338,11 +338,43 @@ minetest.register_abm({
 	interval = 1,
 	chance = 2,
 	action = function(pos, node)
+		local meta = minetest.get_meta(pos)
+		local p1 = minetest.string_to_pos(meta:get_string("portal_frame1"))
+		local p2 = minetest.string_to_pos(meta:get_string("portal_frame2"))
+		if not p1 or not p2 then
+			return
+		end
+
+		local axis
+		if node.param2 == 0 then
+			axis = "x"
+		else
+			axis = "z"
+		end
+
+		local v1, v2 = table.copy(pos), table.copy(pos)
+		v1.y = v1.y - 1
+		v1[axis] = v1[axis] - 1
+		v2.y = v2.y - 1
+		v2[axis] = v2[axis] + 1
+
+		if vector.equals(p1, v1) or vector.equals(p1, v2) then
+			local width = math.abs(p2[axis] - p1[axis]) - 2
+			local xwidth, zwidth
+			if axis == "x" then
+				xwidth = width
+				zwidth = 0
+			else
+				xwidth = 0
+				zwidth = width
+			end
+			local height = math.abs(p2.y - p1.y) - 2
+		
 			minetest.add_particlespawner(
-			32, --amount
+				32 * width * height, --amount
 				4, --time
 				{x = pos.x - 0.25, y = pos.y - 0.25, z = pos.z - 0.25}, --minpos
-			{x = pos.x + 0.25, y = pos.y + 0.25, z = pos.z + 0.25}, --maxpos
+				{x = pos.x + 0.25 + xwidth, y = pos.y + 0.25 + height, z = pos.z + 0.25 + zwidth}, --maxpos
 				{x = -0.8, y = -0.8, z = -0.8}, --minvel
 				{x = 0.8, y = 0.8, z = 0.8}, --maxvel
 				{x = 0, y = 0, z = 0}, --minacc
@@ -354,6 +386,8 @@ minetest.register_abm({
 				false, --collisiondetection
 				"mcl_portals_particle.png" --texture
 			)
+		end
+
 		for _,obj in ipairs(minetest.get_objects_inside_radius(pos,1)) do		--maikerumine added for objects to travel
 			local lua_entity = obj:get_luaentity() --maikerumine added for objects to travel
 			if obj:is_player() or lua_entity then