You're using premiere pro on a high end top of the line PC and your still struggle to preview video with little if not any effects.
Simply answer may be - The video Codec.
H264 / H265 are very compressed and difficult to process.
Transcoding the video to something like ProRes 422 will make a larger file but preform much better.
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Maybe you've heard that Premiere Pro isn't good at H264, H265, HVEC, or other encoders and want to know how you can use your H264, H265 to be in an editable state but transcoding tutorials are kind of hard or difficult to come by.
This video does go over how to simply transcode your H264 MP4 or MOV file into a QuickTime ProRes format in which I personally suggest ProRes 422. Keeps the same great detail from the H264 format and makes it buttery smooth on premier pro for clean easy to work with editing performance
A great way to optimize your premiere pro performance is by transcoding the footage into a video editing friendly format such as ProRes 422.
