Chrome is optimized right up to its eyebrows. If you are using Google distributions of Chrome binaries, I wouldn't expect improvements from build tweaks.
One bit of small feedback - I would say your landing page is very busy, it could use some more space separating content once you start scrolling down past the top part.
I know for a fact that anonymity can be used to encourage diversity of thought and honesty on public channels - this is the feedback I get from customers of a service I run (https://AnonymityBot.com).
It allows Telegram users to hide in plain-sight, within the noise of other Google Translate web users.
I'm pretty sure that using the official pre-built java SDK, as suggested by the author, would allow Google to cluster the content of Telegram users (since app-specific id/token should be sent).
Other than that, a great read and kudos to the author for shedding light on it.
I think Google can still cluster Telegram users pretty easily, especially now that that the method is in the open.
Yes, Telegram fakes the user-agent, but the rest of the request still looks very different from a request an actual browser would do. (No referrer, missing headers, different connection pooling behaviour, possibly different TLS and HTTP2 behaviour, etc).
So if Google is doing any detection for browser vs non-browser requests, those requests should show up as suspicious.