Video buffers on chromecast only

I have always had this issue. But all other times it was experimental. Now this laptop is my dedicated media server. I can watch videos on highest quality on my mobile without any buffering. But on chromecast, even an old 360p-480p cartoon short would buffer every 2 minutes or so. Sometime it will run fine for some time and then buffer hard for next 20-40 seconds. sometimes it would go half an hour without any hitch. After some searching I have already set some settings but to no satisfactory improvement.
1 Turned off secure connections.
2 set transcoding to make my cpu hurt.
3 set background x264 transcoding speed to faster.

Server details :
Server Version#: 1.18.9.2578
Chromecast Gen2
300 mbps wifi router 2.4 ghz single channel.
Windows 10 x64 1909 Update
Intel core i5 3340M 2 core 4 threads.
6 GB RAM.

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