eGPU for Blender on iMac 2017  

Hello,

I have 2017 iMac 5K (3,4 GHz Intel Core i5, Radeon Pro 570 4 GB, 40 GB 2400 MHz DDR4) and I want to work with Blender 2.82, but it's big problem - Blender is too slow on rendering. 🙁

Is possible to get better performance with eGPU? Have anyone any experience with this? And what eGPU did you recommend?

Thank you