better suggestion
max FPS in minecraft, adjust the FPS of the recording software, and lower the bitrate if you can. more fps + higher bit rate = more work on your cpu.
you want the Source (minecraft) to be performing the best it can then you record off that, cuz recording at "1080p" with "60fps" or w/e is garbage if the Source is 500x600 @ 25fps.
another suggestion is to improve the environment its running in, opening up taskmanager when your computer starts and monitor what the CPU load is then ending services/programs to get it to go lower then where its normally at, something i personally do for client's computers that i work on is disable certain windows services and increase the virtual memory slightly (just google it). for example if they don't have a printer they don't need the printer service that always runs, if they never leave their house with their computer they don't need the dhcp service always runs and is only used once every other day (which i only disable with the owners consent), if they never use windows media player then the wmp network share can be disabled (cuz most ppl dont even know how that works) and there's a thousand more things you can probably disable but thats a good start ^
finally the last thing i have to say is regarding your mic, the static to me sounds like its coming from a sensitive and Powered microphone cuz due to my experience when ever we used Batteries on a mic (like wireless microphones for ppl on stage) and then you got a standalone speaker there would always be a funky static sound that would require some sort of sound cancelation, so dig in your sound settings for "echo reduction" or "DC offset cancellation" on your mic and turn it on (DC offset is what i personally use to get rid of the static on my own mic)
hope this helps
