The error says to add to config, but it does not work

[ghost]

Failure message: Phosphophyllite (phosphophyllite) has failed to load correctly
    java.lang.IllegalStateException: Performant is incompatible with Phosphophyllite
    This is a known issue with performant and it breaking other mods, the author does not care
    GitHub issue on the matter: https://github.com/someaddons/performant_issues/issues/70
    To bypass this check add "bypassPerformantCheck: true" to your phosphophyllite config
    If you bypass this check I (RogueLogix) will not provide any support for any issues related to Phosphophyllite or the mods that use it
    If you believe your issue is unrelated, disabled performant and reproduce it
    By choosing to bypass this check you understand that here there be dragons

The config does not look like it will accept just that at the end of the file....

[ghost]

As adding that line will not be json...

{
    GUI: {
        /* 
         * Valid range: [50,)
         * Default: 200
         */
        UpdateIntervalMS: 200.0,

    },

}

[RogueLogix]

outer/first json scope

[ghost]

Like this?

{
    bypassPerformantCheck: true,
    GUI: {
        /* 
         * Valid range: [50,)
         * Default: 200
         */
        UpdateIntervalMS: 200.0,

    },

}

[ghost]

Sir I dont understand what I do

[RogueLogix]

That will work, however I recommend you heed the warning and just remove performant. It doesn't actually make anything run faster. What it does amounts to faking the tick number, breaking other mods in the process.