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Well, the legal FPS for an airsoft gun is 450, but you can get snipers, AEG's, etc. that run up to 600 FPS and beyond.
6600 fps
275 fps
360 FPS
24/25/50 fps
No, the FPS will stay the same. The size of the tank determines how many shots you can take before you have to refill it.
The Marksman repeater is rated at 200 FPS.
On average YouTube videos run at 30 fps.
No it's a 3rd person shooter, but it's still great.
As many as the cartridge is capable of.
FPS = Frames Per Second. It is a measure of how many frames of video is generated every second. Higher FPS means smoother video.
You will have to experiment by shooting as many different types as you can find/afford. Weapons exhibit preferences for certain weights/brands.