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For what it is worth, an 8" barrel is considered by some to be the best balance between shortish barrel length and performance. A reason why the CZ Scorpion Evo 3+ has a 7.9" barrel.
I don't know where the "sweet spot" is for 9mm, but I do have some chrono data from some Federal 124gr +P HST.
Sig P290RS 2.2" barrel = 977fps
CZ SP-01 4.6" barrel = 1200 fps
CZ Scorpion 16" barrel = 1361 fps
So I would guess that an 8" barrel is going to be between the last two at 1250 fps or so?
http://www.ballisticsbytheinch.com/9luger.html
As per this link ... it would depend on the specific load.
IE , Generally, +P loads would benefit more that "bulk'ish" , lower speed , priced ammo.
In context to sub-sonic loads .. not much increase velocity wise.