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My LWC works smoothly when testing with small datasets, but performance drops noticeably with real production data. Page loads become slower and interactions lag. I’m not doing anything obviously heavy on the client side. I’m trying to understand where the performance bottleneck usually comes from in such cases.
The slowdown usually comes from server-side data handling rather than the UI itself. Large SOQL queries, excessive serialization, and returning unnecessary fields all increase response time. On the client side, rendering large data structures or repeatedly re-rendering components also adds overhead.
Most teams solve this by limiting queried fields, adding pagination, caching results, and ensuring Apex methods are purpose-built for UI consumption.
Takeaway: LWC performance issues usually start in Apex, not JavaScript.