Does Mongoose slow down MongoDB queries?
It adds some overhead: hydrating full documents, running validation, supporting middleware. For most apps this is negligible. For high-throughput reads, use .lean() to skip hydration. For high-throughput writes, the raw driver may be better.
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More FAQs in Mongoose vs Raw MongoDB Driver: Which to Use
Mongoose for most apps. Schemas, validation, population, and middleware prevent bugs. The raw driver when you have highly variable schemas, high-throughput writes, or need maximum control. Mongoose is the right default.
Schemas and validation, middleware hooks (pre and post), population for relationships, instance and static methods, and a big community. You write less boilerplate and catch bad data at the schema level.
Slower than the raw driver due to hydration and validation. More magic that you sometimes fight. Heavier learning curve for advanced features like discriminators and complex middleware.
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