slow with large videos

now I'm making a videos app using flutter and chewie
all my videos get from Server through API based on Laravel. but all videos has large size for example 500MB, 600MB, or 700MB. the problem is when play the video it playing very slowly. although internet speed in fine.

How i can solve this issue ?

The issue names no source file, test, or entry point. Start by reproducing playback of the reported 500–700 MB videos in the Flutter/Chewie app while they are served through the Laravel API, then trace where playback slows. Done would require a confirmed cause and an agreed, testable fix, but the report does not define either.

Written by the indexing model from the issue text.