...I seem to have a bit of a problem ... I'm getting problems with the sound and a very slow rate of fire when in the cockpit
Yes, it is somewhere in the 98 pages... I didn't know about this either until I experienced it, but if your system is computationally over-taxed with too many aircraft in the air or ground objects, then RoF will play at half speed until something resolves it (i.e a flight lands). What are your system specs, marginal to low? I'd characterize mine as middlesies...
The only way to correct is to tweak the mission generator to lower the number of flights and/or lower the number of ground objects. Poke around in the options, you'll see the variables. Lower number of opposing flights and/or number of aircraft per flight for both sides by just 1 or 2 a little at a time. It will resolve eventually.
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