Why is my video editing software so laggy?

I just bought MAGIX Movie Edit Pro 2016 and the effects are cool but the problem is the software is really laggy to the point where I can barely see what I have edited in the preview screen. I did film with a NIKON D 3300 at 60 fps (not sure if that has to do with anything) I believe my latptop has an i3 processor, could it be my pc is too slow?

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Will this lense match my camera?

I am looking for 300 mm lenses for my camera. I found one that someone is selling and i am wondering if it will fit my camera.

It is a 70-300mm being sold with a nikon d3100. I have a nikon d3300. Will the lense fit my camera and work normally?

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Nikon D3100 upgrade - Please reply?

I’ve D3100 and kit lenses(18-55mm) and 50mm 1.8G. I’m not a pro but I really love photography and planning to do more going forward. I do portrait and landscape photography and I DO NOT take videos. I’m looking for great photo quality. Do I need to upgrade my camera or have to invest in lens? Please advise.

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How much can I sell 4 lenses and a nikon d7000 for?

How much can I sell 4 lenses and a nikon d7000 for? - 1

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