There is no Performance tab in 5.5
Is this a bug or policy?
You can use the debug hud to measure different performance numbers of your effects.
If you mean the toggle button that would show the numbers in-line in the emitter, that is not compatible with the new VM. You can disable the new VM in the niagara plugin settings and the button will show up again.
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Thank you for reply
Would you please tell me where can I find niagara plugin setting menu?