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[WxTech]

I cut out the beginning, where nothing of note is happening. The track is running in the 'normal' way, with the original camera changes. I have the in-game fps display active.

From the video description:

In Il-2 1946 the commonly used 'benchmark' for testing computer performance is The Black Death track, created many years ago by the game developers and still relied on by the player community. My rig was purchased in 2019, having an i5 CPU overclocked to 4.8GHz, driving an RTX 2060 GPU at 2560x1440. I have my GPU set to a fixed max frame rate of 63, in large measure to reduce the rate of zooming for the "smooth zoom mod" I use. This video is recorded at 1920x1080, 60fps.

Normally I play with the conf.ini setting, Effects=0, which does not add ground shadows for effect particles nor illumination shadowing upon them. Here I have set Effects=2, which adds both of these lighting/shadowing elements. Compared to Effects=0, Effects=2 pretty much halves my frame rates when many smoke effects are being drawn. Where normally my slowest frame rate here would be about 45, in this video it sinks to as low as 23. (These low values are often poorer than might seem, as they tend to be of short duration.)

Two things of note to watch for:
- The rockets have true randomness applied as an initial aim offset and have slight oscillation applied during flight ('turbulence' in effect on unguided rockets).
- The debris from the two-plane collision has a more realistic fall pattern. Formerly this debris would fan out laterally and also travel quite far down range, resulting in a fall pattern in the form of a very wide arc extending far to the sides from the ground track. Now the debris slows more realistically and hence reaches the surface in a more sensible pattern.

These two changes involved notable code changes in a few classes.

There are many other things I could point out, but a veritable book would be required to catalogue the whole lot. 

[genXgamer]

Did I see an aircraft crash into the water without a splash?

[WxTech]

For the past 15-ish years I recall all game versions showing that last FW dunk into the river as generating a pitifully small splash. I've not cared enough to determine with certainty what effect is used, but it seems to be related to wreckage. Other early tracks having planes going down in water may not make the slightest disturbance whatever. This has to do with fundamental code changes since these tracks were created, way back in the early days. The way the impact event was treated has evolved, and the new code does not do things in the same way as was done way back then.

Try one of the first tracks in the list, such as the Bf-109 v P-39. You'll see planes swallowed by the water with nary a ripple.