Need Solution for android video player video from url

I'm developing an app where I want to stream video from URL. I'm currently using ExoPlayer for streaming and it is working fine but it has a delay of around 5 seconds before the video loads and starts playing. Is there any way to reduce this start time or some way like how TikT*k streams their videos on the go. There's no lag involved in TikTok. Could anyone give some workaround for this?