Uhm... The absolute Y-position of the curve on the graph is secondary to its shape. Also, the scalability discussion is largely pointless if the sample set covers only 6 CPUs.
Intel TBB scales proportionally, which is precisely what you'd want here. Junction starts to flatten out on 6th CPU, which implies that it has fundamental design issues that crop up at higher CPU counts. Chances are that its performance not only won't scale further, but will actually drop further down the graph.
On other hand TBB code can be put throught some routine code optimization (hand-coded assembly and such) to increase its performance without affecting its linear graph shape.
Intel TBB scales proportionally, which is precisely what you'd want here. Junction starts to flatten out on 6th CPU, which implies that it has fundamental design issues that crop up at higher CPU counts. Chances are that its performance not only won't scale further, but will actually drop further down the graph.
On other hand TBB code can be put throught some routine code optimization (hand-coded assembly and such) to increase its performance without affecting its linear graph shape.