explain further and show some screenshots to better illustrate the question/problem ?
I made a 4 minute video in Adobe Premiere. I exported that video to my files. I imported that video to Adobe After Effects. I prerendered the video and it still is lagging when I play it.
what are your render settings? how are you playing your video? Are you new to the software? Read here about how to export a video in After Effects: Basics of rendering and exporting in After Effects CC