It sounds like the issue is probably unrelated to using Pluto, and likely more to do with the streaming libraries used and memory management - but that's just a guess based on the minimal info here. When you say it couldn't handle streaming data, what issues did you have? By "streaming data with Pluto notebooks on the web" do you mean PlutoSliderServer or something else?
FWIW, Fons and co are very responsive to user issues (for eg. on the Zulip pluto channel [1]), so if you haven't tried that already, I'd recommend that. Similarly with Stipple, I believe they're trying to build a company out of it, so they'll probably be very receptive to business use cases and making them work.
[1] https://julialang.zulipchat.com/#narrow/stream/243342-pluto....