minimal example of 15ms lag

resources/shaders/color-passthrough.fragment

@@ -1,9 +1,11 @@
 #version 450
+
+// These come in from the previous shader (vertex)
 layout(location = 0) in vec4 out_color;
 
+// This goes out to the bound image in window_size_dependent setup
 layout(location = 0) out vec4 f_color;
 
-
 void main() {
     f_color = out_color;
 }