In non functional languages like JS here, FP is for sure slower.
Whether that's important in your space is up to you. I've found that thinking about performance first over code quality has resulted in less performant code for other reasons.
And you can achieve asymptotically equally performant code using libraries or languages built for this style of programming. Given that functional programming isn't really taught, however, that's not the norm.
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In non functional languages like JS here, FP is for sure slower.
Whether that's important in your space is up to you. I've found that thinking about performance first over code quality has resulted in less performant code for other reasons.
And you can achieve asymptotically equally performant code using libraries or languages built for this style of programming. Given that functional programming isn't really taught, however, that's not the norm.