The answer
For most apps. If your hot feature is 80% of traffic, scaling the whole app is fine. Microservices help when features have very different load patterns (e.g., chat is real-time, feed is read-heavy).
Scalability Comparison: Monolith vs Microservices
When is monolith scaling enough?
More FAQs in Scalability Comparison: Monolith vs Microservices
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.
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.
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