针对不同博客，改动略有不同，本文仅供参考，我这里把fps开关放到了中控台

效果预览

魔改步骤
  1. 修改 themes/butterfly/layout/includes/header/nav.pug
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    #page-name-mask
      #page-name
        a#page-name-text(onclick= 'btf.scrollToDest(0,500)')=navTitleName
      #menus
        !=partial('includes/header/menu_item', {}, {cache: true})
    +  #nav-left
    +    #fps-group
    +      #fps
    +      span.fpsText=_p('FPS')
  2. 修改 themes/butterfly/layout/includes/console.pug
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    if theme.console.keyboard.enable
       .console-btn-item#consoleKeyboard(onclick='manxin.keyboardToggle()', title='快捷键开关')
           a.keyboard-switch
               i.fas.fa-keyboard
       .console-btn-item#consoleCommentBarrage(onclick='manxin.switchCommentBarrage()', title='热评开关')
           a.commentBarrage
               i.fa-solid.fa-message
    +   .console-btn-item#consoleFPS(onclick='manxin.FPSToggle()', title='帧率显示开关')
    +       a.FPS-switch
    +           i.fas.fa-gauge
  3. 新建 themes/butterfly/source/manxin/fps.js（引入js略）
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    let Jay_showFPS = !1;
    "true" === localStorage.getItem("showFPS") ?
        ((Jay_showFPS = !0),
            document.querySelector("#fps-group").classList.add("show"),
            document.querySelector("#consoleFPS").classList.add("on")) :
        ((Jay_showFPS = !1),
            document.querySelector("#fps-group").classList.remove("show"),
            document.querySelector("#consoleFPS").classList.remove("on"));
    var showFPS = (function() {
        let e,
            t,
            o,
            n,
            a,
            i =
            window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function(e) {
                window.setTimeout(e, 1e3 / 60);
            };
        (e = 0),
        (t = Date.now()),
        (n = function() {
            (o = Date.now() - t),
            (e += 1),
            o >= 1e3 && ((t += o), a(e), (e = 0)),
                i(n);
        }),
        (a = function(e) {
            $("#fps").html(e);
        }),
        n();
    })();
    var manxin = {
        FPSToggle: function() {
            Jay_showFPS
                ?
                ((Jay_showFPS = !1),
                    document.querySelector("#fps-group").classList.remove("show"),
                    document.querySelector("#consoleFPS").classList.remove("on"),
                    localStorage.setItem("showFPS", "false")) :
                ((Jay_showFPS = !0),
                    document.querySelector("#fps-group").classList.add("show"),
                    document.querySelector("#consoleFPS").classList.add("on"),
                    localStorage.setItem("showFPS", "true"));
        },
    };
  4. 新建 themes/butterfly/source/manxin/fps.css（引入css略）
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    /* FPS */
    #fps-group.show {
        opacity: 1;
    }

    .nav-fixed #fps-group,
    .not-top-img #fps-group {
        color: var(--Jay-fontcolor);
    }

    #fps-group {
        opacity: 0;
        display: flex;
        flex-direction: column;
        margin-left: 16px;
        color: var(--Jay-white);
    }

    #fps {
        z-index: 10000;
        font-size: 12px;
        font-weight: 700;
        transition: all 0.3s ease 0s;
        line-height: 1;
    }

    #fps-group .fpsText {
        font-size: 12px;
        line-height: 1;
        opacity: 0.6;
    }
        /* FPS */