Research how to use proxies. Proxies are copies of your original footage encoded at lower resolution, lower quality, or just in a less processor-intensive codec. You use them while you're working on your project, and then swap back the high quality files when you do your final export. A bit like offline and online video editing from the days when dinosaurs ...
You want to use the Effect Controls panel:
As the help says, there are several standard effects added to a clip in the timeline, the effect you want to look for is Motion. Select the clip in the timeline, go to the Effect Controls panel, and expand the Motion effect. ...
There are several widely adopted file-based QC systems on the market. They include:
Telestream (formerly Tektronix) Aurora
Note that as of NAB NY 2019, Telestream had not announced plans for what will happen with Vidchecker and Aurora after the Tektronix acquisition.