> I've looked online and it appears that the 530 is about 20% slower than the 2015 rMBP 15" iGPU.
This is probably due to the increased screen resolution. If you make the resolutions of both models the same I suspect it will be comparable or faster in benchmarks.
(2015 MBP default resolution of 2880×1800 vs new, 3360×2100)
Something similar happened with iPads came out with retina displays. Pushing lots of pixels consumes more performance.
a little bit akward that they raised the resolution. 2880x1800 was just fine, having 3360x2100 also means that you again needs to tweak everything if you might use linux.
This is probably due to the increased screen resolution. If you make the resolutions of both models the same I suspect it will be comparable or faster in benchmarks.
(2015 MBP default resolution of 2880×1800 vs new, 3360×2100)
Something similar happened with iPads came out with retina displays. Pushing lots of pixels consumes more performance.