My FPS drops by around 20 during runtime. What's the problem, and how can I improve this?

Development Programming & Scripting
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1

The display effect is in Image 1, and the blueprint logic is in Image 2 and 3.

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11258×1261 66.9 KB

2
22686×1265 213 KB

3
31319×1212 274 KB

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I think I’ve located the issue. My FPS increases by nearly 20 when I disable the lights. Could you tell me how to optimize lighting performance and refine this blueprint logic?