Low fps using RectAreaLight: alternatives?

Hi guys, I am building a scify scene where I am using RectAreaLights to simulate strip lights (you can see the RectAreaLightHelpers in the image).


I have noticed a very low fps performance when using these type of lights (no more than 20-30 fps). If I use any other type of light such as SpotLight or PointLight I get 60 fps steady.

Is there anything I can do to improve performance? Or some other technique I can use to simulate strip lights?

threejs: r98
browsers: safari, chrome
os: macos, windows, ios


Maybe try to use lightmap?

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Also see:

Thanks for the suggestion, I need to study the topic a bit first (never used a lightmap ^_^)