How do I make my pc build faster for video editing?

I have a dell t1700 case with the dell 048DY8 motherboard, i7 4790 processor, 8gb ram, and a NVIDIA quadro k420 gpu and a 290w psu. And a 2tb harddrive. I edit videos on adobe premiere and it’s sometimes laggy and slow, what can I do or what do I need to upgrade to make this better for editing. Thanks!
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