How can I limit framerate in SH5?

[Jimi-James]

Hi all!

First time writing on these forums. I've been reading you everyday for months but never needed to write since all my questions were answered by reading others' posts.

I have a GTX 260 and the game runs all maxed out on 1080p with an acceptable performance of 30 mean fps. But the game lags sometimes when the framerate changes abruptly i.e. if I pointing the view from a ship sinking with fire and dark smoke to a clean angle where the computer has considerably less load to render.

I know from other games that a good way to avoid this is just to limit the fps. In my case I'd like to limit it to 30fps. Anyone knows where is the config file and the option to do this?

Thanks very much in advance.
Regards.