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You do spawn a new monolith. You make one group the CPU intensive one and route that traffic there. Same concept as a microservice except that it comes with a bunch of dead code. But the dead code is not that resource expensive these days.

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I see, so basically we are applying scaling, but instead of scaling the bottleneck as its own part we scale everything.

I somewhat fail to see how that saves much effort; routing setup sounds like a hassle.

What we‘re using at my work is just a mono repo with all services in it, which works pretty well, and we‘re like 7 BE devs

You don't have to write an API layer and get type checking among some other benefits. Is it a ton of savings? No, but I'd describe it as a significant amount of effort and lower complexity.

To be fair, with libraries the API layer can be essentially zero code, and with type checking. That's how it worked when I was at my previous gig.

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