Why do I play an AIVU 180 degree video, which has always been able to play smoothly, and then suddenly played too laggy recently? The video is embedded locally, without network factors, and the video parameters and program code have not changed at all. I also tested playing videos around 400m in size, and the CPU displayed 400-500%, but it was very smooth. When playing a video of 1G or so, the clip is 20-30%, but it is too laggy. Except for the different video duration, other parameters are the same. May I ask what caused the lag.