Icing can happen very fast, but usually it builds up in a much longer period. This always very fast icing is unrealistic for sure. Built it up in a range of 10-30 minutes to different degrees… And in very rare situations make it built up in 2 minutes if the conditions are accordingly.
The icing effect have to be different on airliners too, i heard 2 well-known real world pilots/streamers state, that they never seen such extensive icing on airliners and yeah, not such a fast built up.
In general the effects are great, but slow it and make it more variable and much less end results. That really looks like a cartoon. And don’t forget to reduce the effect on longer flights and in conditions as that ice get ripped off, if youre flying in (slightly) warmer areas.
It’s very similar with the trees in low or medium settings (i am not able to say if its better in the high or ultra setting)… decrease/half the effect (or the tree width/ground coverage) and you will have much less folks complaining. If you have trees, totally covering the ground that you cannot see houses or other stuctures anymore, or you have trees everywhere, where you usually have small bushes, that breaks the immersion. Southern citys are looking like norwegian woods.In case of the trees, i turned it off in the .cfg, and its better then trees everywhere… And with icings its the same, please adapt it to the conditions and the aircraft. One fits all doesn’t apply here… 
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