Mid Flight Graphics Configuration?

[Wayfarer]

I set the Ground Object Density to High for the first time today. Then, also for the first time, got surrounded by a swarm of Fokkers and ended up at about 150 feet over a forest. At this point, the frame rate dropped really low and the the game really started to stutter, so I need to adjust some settings.

Is it possible to do this in the middle of a flight? When the stutters were really bad I couldn't judge the behaviour of my aircraft and nearly flew it into the trees. I really wanted to be able to pause and alter the graphics, because I didn't want that to be the cause of killing my pilot, but I couldn't think if there was any way to do it.

[Wayfarer]

Thanks Uncleal. I've altered my sliders a little so I'll see how I get on.