Do monoliths scale?
Yes. You run multiple instances of the monolith behind a load balancer. For most apps, this scales well. Split into microservices only when different features have very different load patterns.
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More FAQs in Scalability Comparison: Monolith vs Microservices
Each service scales independently. The hot service gets more instances; the cold ones do not. This fits apps where different features have very different traffic patterns.
You scale the whole app even if only one feature is hot, a memory leak in one feature affects all instances, and a long-running request on one instance can slow others.
More deployments to manage, network calls add latency and failure modes, and caching is harder because each service has its own cache.
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