How to really tackle excessive React re-renders?

hey everyone, so i just launched a new feature in my saas app, and it's built with React. it's feeling a bit sluggish. nothing too complex but users are starting to notice the lag. it's kinda frustrating because it's not even a super heavy component.

i'm pretty sure it's related to too many unnecessary component re-renders. especially when state changes in parent components, it feels like everything below it just re-renders even if props haven't changed. i've tried some basic stuff but it just feels like i'm missing some critical optimization techniques for real-world scenarios. it's like a cascade effect and i'm losing my mind trying to pinpoint the exact culprits.

• What are your go-to strategies for identifying and fixing excessive re-renders in a real-world app? like, beyond just looking at the console.
• Any specific tools or dev practices beyond React.memo and useCallback that have made a huge difference for you? i'm open to anything that actually works.
• Looking for practical, actionable advice, not just theoretical stuff. something i can implement Monday morning, you know?

help a brother out please...