Great idea, Pupo. I'm away from my PC right now (this is my iPad talking ;) ), but you've outline a good quick test for

1) large AI formation problem?

and

2) multiplayer problem with manned bombers?

As you pointed out, the human pilots/crew of the manned bombers didn't experience lag, but all the attacking Red pilots did. Plus the lag wasn't a mere slowdown in fps; we all experienced a game-crushing 1 fps slideshow. In my case the 1 fps only returned back to the normal 70 - 90 fps smooth play when the multi engined manned bomber(s) had flown out of the immediate vicinity.

Will try this later today at first opportunity and report back here with my results.

Smooth as custard very happy chap

I agree it's a bug (or at least a strange way of implementing light), but not just for Spitfires.

Black6-might be important info
 

Was having lots of crashes with the mini patch update, had tried most tips with no luck.
Then i disabled hyper threading on my i72600k and also turned off gamebooster and since then ive had no CTD's and much less stuttering.

Might be something to look into.

Grapics went all weard when i crashed

Agreed it shouldn't be having such a huge effect on performance, no other game I have played has seen such an increase in performance after turning off hyper threading/ multi threading.

Just had the weirdest crash so far since hotfix.

Cache cleared out of habit, direct connect to ATAG 1, spawned, warmed up, climbed, alone in the sky and bang. Launcher crash.

Also any more than 1 on 1 combat turns into a slide show.

This has nothing to do with Furbs' post, but I felt like having a moan.

Feels like we've regressed 12 months. :(

Edit: 3 dump files and a log sent, before anyone asks!

This is the 2nd person in the last few days that has reported having better results by configuirng their PC to turn off HT

Here is the one from a day to two ago on HT

http://forum.1cpublishing.eu/showthread.php?t=31976

Some good info there too

Try in-game vsynch off and GPU 3D vsynch On and Triple Buffering on. Triple buffering helps prevent timing issues that can see your vsycnh halved if TB is not enabled. I don't know if the in-game vsynch invisibly handles its own triple buffering.

I had a first: while flying on ATAG my 109 literally disappeared leaving my soul floating mid air ... first time really.