(Solved) Forbidden Siren (Pal) drops FPS, how to remove and film grain

[SSTEHOROR]

In the gameplay the game works at 60 fps
but out of nowhere the game freezes for a second and drops to 43 FPS and always works  like that.
it's unplayable if every 10 seconds the game is freezing.
it goes from 60 fps to 0 to 43 for 2 seconds and back to 60 fps again.

I'm using version v1.7.4942

I would also like to deactivate the film grain effect.

I'm not sure if it was this
but I turned on vertical sync and now it works
I also understand that the grain effect is something "important in the game"

[jesalvein]

Please post the contents of the emulog.txt file after the problem occurs. The file can be found in "My Documents\PCSX2\logs" for the installer version or in "PCSX2\logs" for the portable/binary version.

Please make sure to enclose your emulog in code tags like so (remove the empty space on the closing code tag!):
[code]
Pasted emulog goes here
[ /code]