Remove unused CSS and Javascript

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I have been working on improving the speed of my website for the past few days. I have implemented image optimization but the speed is still not good due to large dom size and unused CSS and javascript. 


How can I figure out which part of code is unused and which is not?


here is a screenshot of google developer tools. Is this red part unused code and should I just remove the above highlighted code with red boundary at the left completely. How to find it and identify which code is useful or not?


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