new Macbook Pro for rekordbox

Hello! I am using now a

MacBook Pro (13 Zoll, Anfang 2011)
i5 2,3

500 GB SSD

16GB RAM

Intel HD Graphics 3000, 512 VRAM, 1280 x 800

Since a few monts I am using rekordbox and I do have some sound issues. The support team here knows about the problem. But we can't solve it. We came to the conclusion that die graphic chip is a little bit too slow.

So my question: Is it clver to buy a (used) macbook pro 15,4 with this specs:

Betriebssystem: Mac OS Mojavi 10.14.2
Prozessor:
Intel Core i7-3615QM, 2,3 GHz Basisfrequenz, 3,3 GHz mit Turbo Boost
1. (integrierte) Grafikeinheit:
Intel HD 4000
2. (dedizierte Hochleistungs-) Grafikeinheit:
Nvidia Geforce GT 650M 1GB GDDR5 VRAM
Arbeitsspeicher:
8GB 1600 MHz DDR3

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How much do I improve my system with that? Will I be happier wth that system or is there less effort than I think?

Regards
Johannes