system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come videos don't load like they used to?

It seems like not long ago one could click on a video, hit play and then pause it so that it could load all the way before watching it. One could easily re-wind by clicking any time in the video and it would already be loaded.

Nowadays it seems like you click the video, hit play and then pause and the video does not load all the way. It only loads a little at a time and then when you try to rewind it has to buffer and re-load again.

Whatever happened to letting a video load, watching it and rewinding easily without all this re-loading?
gpt
They changed the way buffering works to try to cut down on data usage. Many people dont watch the entire video so there is no point in loading the whole thing. and internet is faster these days so most people's connection can buffer faster than the video plays. So they only buffer slightly ahead of where the person is in the video.