I just tested God of War for PS2 on my system (Intel Pentium G4500 @ 3.50GHz, 8GB RAM, Intel HD Graphics 530) with 5.19 and it was running okay.
Not 100% fullspeed (i played from the beginning until the 2nd fight against the giant snake/dragon), with some slowdowns here and there, but it was playable.
At the very beginning i noticed a relatively high input lag.
But later in game the control was responding better (but not perfect).
I will test the 5.20 beta version with my other system (with i7-4790K @ 4.00GHz, 16GB RAM and a GTX 1070) and then see, if the game runs better on this machine.
I just tested the 5.20 beta with my other System (i7-4790K with GTX 1070).
At default the game God of War on PS2 was running very slow (below 50% i guess), even way slower then on my other system with Pentium G4500 (Intel HD Graphics 530.
But after i activated nvidia drivers by editing the recalbox-boot.conf on the root of the USB-Stick by removing the # in front of the line "#nvidia-driver=true", the performance was great! The game was then running flawlessly at 100%