I have bet my own so many times, I figured I'd give yours a shot. Calm down and count to 10 Mother, this is the internet.
Err.... calm down? OK....
And no I can't, I'm lazy..... Do it your darn self. http://forum.framerateissues.com/
I want to know why you think it would hurt framerates, not whether it actually would... that's two completely different subjects. If I went looking for how something like the OP could murder framerates, I could look for hours and not find anything... because it wouldn't.
By the way, if you honestly think that displaying a simple semi transparent bitmap over the canopy would massacre framerates, you probably shouldn't fly fighters, or use the Ostwind or Wirblewind, as the reflector sight is the same thing.
You definitely shouldn't fly the RV8 either, as it has
exactly what the op is asking for (albeit not very pronounced by default)

These are the guilty files in the process...
I'll warn you the masses of data stored in them could slow your computer to a crawl.... if you don't believe me look it up....
First a 8 bit, 512x512px, 257KB bitmap named ENV.bmp(twice my RAM!)

And another 8 bit, 128x128px 17KB bitmap named XENV.bmp(more resource intensive than Windows Vista!)
