front-end very slow to load

[jonners]

Thank you both for your feedback and yes. It looks like this is due to the HifiBerry Dac Pro.
I'm in the process to replace the HifiBerry DAC with an AUDIOPHONICS DAC I-Sabre ES9038Q2M.

Which power supply would you recommend to me for a hifi setup?

Thank you!

I would go for the Allo Nirvana, which Audiophonics sell. Allo also do a cheaper supply.
If you want a linear supply you will find those at Audiophonics too, including the Allo Shanti if you have more money to spend.