The Ratchet & Clank Trilogy [BCES01503]

Frame-rate is too low imo. Try different settings e.g using Mega block size instead of safe, try 1-4 preferred spu threads etc. Ideally the game should run atleast at a locked 60 on a 9700k, frame-rate is really important here because the game-speed is tied to the games frame-rate, so 30fps will be half-speed. And if you aren't even maintaining 60fps on a 9700k most users will be running it at around 30fps or lower in intensive areas, which isn't good enough.

I checked with different settings (SPU Treads and Mega block size) but they just lowering the FPS.

Then i checked again compering other stage to the first one, and it seems that only the first stage is causing the instability of the FPS. but the others locked on 60 FPS.

But anyway now we need to check the separate games of 2 and 3, if they are like those, with stable FPS. And if so they are considered playable.