I load Retroarch through the HBG NSP.Not on Horizon, you could try Lakka.
I've never had a PS1 game freeze though are you accessing Retroarch through nsp by holding R to give yourself full Ram and also overclocking in Retroarch?
I load Retroarch through the HBG NSP.
And how to overclock?
Overclocked.It's in the main menu of Retroarch.