better wirer behavior etc

main.lua

@@ -8,6 +8,7 @@ require "libs/TSerial"
 require "_debug_helpers"
 require "_helpers"
 require "input"
+require "profiler"
 require "color"
 require "room"
 require "world"
@@ -145,6 +146,7 @@ function love.draw()
 	love.graphics.draw(finalCanvas, 0, 0)
 	love.graphics.draw(sideBarCanvas, sideBarBox.x, sideBarBox.y)
 	love.graphics.print("Current FPS: "..tostring(love.timer.getFPS( )), 10, 10)
+	PerfProfiler:draw()
 	Dialogue.draw()
 	love.graphics.setCanvas()
 
@@ -164,6 +166,13 @@ function love.draw()
 end
 
 function love.keypressed(key)
+	-- Developer CPU sampling: record a representative moving sequence, then
+	-- press F9 again to write folded stacks for flamegraph.pl.
+	if key == "f9" then
+		PerfProfiler:toggle()
+		return
+	end
+
 	-- Available even while a dialogue is open, so the player never has to
 	-- dismiss something important just to change the colour treatment.
 	if key == "f4" then