My guess it's a common problem with a computer containing your specs. Firstly, one should have not less than 16GB RAM, and preferably 32GB or more. Secondly, using only one drive can put quite a strain on your system. Your i5 CPU is also minimal. Overall, you should ensure all your cache is deleted before you start. My guess is your computer will be quite slow for more complex video work like mulit-camera.
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