Play file(s) from RAM

[GioF_71]

I agree.
At our company we also used circular buffers although in a completely different scenario.

Back to the OP, I see no benefit in "playing from ram", at least on the server side. And I think the renderer(s) already "play from ram". In this client-server architecture, I cannot imagine how having more data in RAM than needed on the media server would yield any improvement.
I think, if anything else, one thing one might want to do is use SSD storage just to avoid the noise of the spinning disk(s)

My .02