When playing https resources after cloudflare cdn acceleration, the memory usage increases a lot

I have found that when using vlc for windows and Android, the memory increase when playing is very large and sometimes causes the app to flicker. There is no problem when using http to accelerate the link, and no problem when using nginx+https. We can be sure that it is a problem with https. Turning off cloudflare tls 1.3 and only allowing tls1.2 didn't fix it either.

demo url:

cloudflare cdn https

https://mp4.qdstt.cn/vip/p1/movie_mp4_h264/1956/4/4/40024/movie.40024.1956.1080p.H264.20210907221908.mp4

cloudflare cdn http

http://mp4.qdstt.cn/vip/p1/movie_mp4_h264/1956/4/4/40024/movie.40024.1956.1080p.H264.20210907221908.mp4

nginx https

https://usa7-lb01.shegu.net/vip/p1/movie_mp4_h264/1956/4/4/40024/movie.40024.1956.1080p.H264.20210907221908.mp4