主题默认的CDN有：local、cdnjs、jsdelivr、unpkg等，但是速度偶读比较一般，要想提高部分标准静态资源的响应速度，走CDN是最好的办法，最好是在国内的CDN。

参考教程：
1.CSDN：Web前端常用CDN网站汇总
2.洪哥：Butterfly CDN链接更改指南，替换jsdelivr提升访问速度
3.安知鱼：目前可用cdn整理

修改教程

修改主题配置文件_config.butterfly.yml的CDN配置项：

分享一下Fomalhaut目前在用的方案：

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# CDN
# Don't modify the following settings unless you know how they work
# 非必要請不要修改
CDN:
  # The CDN provider of internal scripts (主題內部 js 的 cdn 配置)
  # option: local/jsdelivr/unpkg/cdnjs/custom
  # Dev version can only choose. ( dev版的主題只能設置為 local )
  internal_provider: local

  # The CDN provider of third party scripts (第三方 js 的 cdn 配置)
  # option: local/jsdelivr/unpkg/cdnjs/custom
  # when set it to local, you need to install hexo-butterfly-extjs
  third_party_provider: cdnjs

  # Add version number to CDN, true or false
  version: false

  # Custom format
  # For example: https://cdn.staticfile.org/${cdnjs_name}/${version}/${min_cdnjs_file}
  custom_format:

  option:
    # main_css:
    # main:
    # utils:
    # translate: https://cdn1.tianli0.top/npm/js-heo@1.0.6/translate/tw_cn.js
    # local_search:
    # algolia_js: 
    algolia_search_v4: https://cdn.staticfile.org/algoliasearch/4.14.3/algoliasearch-lite.umd.min.js
    instantsearch_v4: https://cdn.staticfile.org/instantsearch.js/4.49.2/instantsearch.production.min.js
    pjax: https://lib.baomitu.com/pjax/0.2.8/pjax.min.js
    # gitalk: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/gitalk/1.7.2/gitalk.min.js
    # gitalk_css: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/gitalk/1.7.2/gitalk.min.css
    # blueimp_md5:
    # valine: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/valine/1.4.16/Valine.min.js
    # disqusjs: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/disqusjs/1.3.0/disqus.js
    # disqusjs_css: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/disqusjs/1.3.0/disqusjs.css
    twikoo: https://cdn.staticfile.org/twikoo/1.6.8/twikoo.all.min.js
    # waline_js: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/waline/1.5.4/Waline.min.js
    # waline_css:
    sharejs: https://lib.baomitu.com/social-share.js/1.0.16/js/social-share.min.js
    sharejs_css: https://lib.baomitu.com/social-share.js/1.0.16/css/share.min.css
    # mathjax: https://cdn.staticfile.org/mathjax/3.2.2/es5/mml-chtml.min.js
    # katex: https://lib.baomitu.com/KaTeX/latest/katex.min.css
    # katex_copytex:
    # mermaid:
    # canvas_ribbon:
    # canvas_fluttering_ribbon:
    # canvas_nest:
    lazyload: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/vanilla-lazyload/17.3.1/lazyload.iife.min.js
    instantpage: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/instant.page/5.1.0/instantpage.min.js
    typed: https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/typed.js/2.0.12/typed.min.js
    # pangu:
    fancybox_css_v4: https://cdn.staticfile.org/fancyapps-ui/4.0.31/fancybox.min.css
    fancybox_v4: https://cdn.staticfile.org/fancyapps-ui/4.0.31/fancybox.umd.min.js
    # medium_zoom: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/medium-zoom/1.0.6/medium-zoom.min.js
    # snackbar_css: https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/node-snackbar/0.1.16/snackbar.min.css
    # snackbar: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/node-snackbar/0.1.16/snackbar.min.js
    # activate_power_mode:
    # fireworks:
    # click_heart:
    # ClickShowText:
    fontawesomeV6: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/font-awesome/6.0.0/css/all.min.css
    # flickr_justified_gallery_js: https://cdn.staticfile.org/flickr-justified-gallery/2.1.2/fjGallery.min.js
    # flickr_justified_gallery_css: https://cdn.staticfile.org/flickr-justified-gallery/2.1.2/fjGallery.min.css
    aplayer_css: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/aplayer/1.10.1/APlayer.min.css
    aplayer_js: https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/aplayer/1.10.1/APlayer.min.js
    meting_js: https://cdn1.tianli0.top/npm/js-heo@1.0.12/metingjs/Meting.min.js
    # prismjs_js: https://cdn1.tianli0.top/npm/prismjs@1.1.0/prism.js
    # prismjs_lineNumber_js: https://cdn1.tianli0.top/npm/prismjs/plugins/line-numbers/prism-line-numbers.min.js
    # prismjs_autoloader: https://cdn1.tianli0.top/npm/prismjs/plugins/autoloader/prism-autoloader.min.js

在分享一下我目前在用的方案：

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option:
    # main
  main_css: 
  jquery: https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js
  main: https://cdn.jsdelivr.net/npm/hexo-theme-butterfly@3.8.4/source/js/main.min.js # /js/main.js
  utils: https://cdn.jsdelivr.net/npm/hexo-theme-butterfly@3.8.4/source/js/utils.min.js # /js/utils.js

  # pjax
  pjax: https://cdn.jsdelivr.net/npm/pjax/pjax.min.js

  # comments
  gitalk: https://cdn.jsdelivr.net/npm/gitalk@latest/dist/gitalk.min.js
  gitalk_css: https://cdn.jsdelivr.net/npm/gitalk/dist/gitalk.min.css
  valine: https://cdn.jsdelivr.net/npm/valine/dist/Valine.min.js
  disqusjs: https://cdn.jsdelivr.net/npm/disqusjs@1/dist/disqus.js
  disqusjs_css: https://cdn.jsdelivr.net/npm/disqusjs@1/dist/disqusjs.css
  utterances: https://utteranc.es/client.js
  twikoo: https://cdn.jsdelivr.net/npm/twikoo/dist/twikoo.min.js
  waline: https://cdn.jsdelivr.net/npm/@waline/client/dist/Waline.min.js

  # share
  addtoany: https://static.addtoany.com/menu/page.js
  sharejs: https://cdn.jsdelivr.net/npm/social-share.js/dist/js/social-share.min.js
  sharejs_css: https://cdn.jsdelivr.net/npm/social-share.js/dist/css/share.min.css

  # search
  local_search: https://cdn.jsdelivr.net/npm/hexo-theme-butterfly@3.8.4/source/js/search/local-search.min.js # /js/search/local-search.js
  algolia_js: https://cdn.jsdelivr.net/npm/hexo-theme-butterfly@3.8.4/source/js/search/algolia.min.js # /js/search/algolia.js
  algolia_search: https://cdn.jsdelivr.net/npm/instantsearch.js@2.10.5/dist/instantsearch.min.js
  algolia_search_css: https://cdn.jsdelivr.net/npm/instantsearch.js@2.10.5/dist/instantsearch.min.css

  # math
  mathjax: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
  katex: https://cdn.jsdelivr.net/npm/katex@latest/dist/katex.min.css
  katex_copytex: https://cdn.jsdelivr.net/npm/katex@latest/dist/contrib/copy-tex.min.js
  katex_copytex_css: https://cdn.jsdelivr.net/npm/katex@latest/dist/contrib/copy-tex.css
  mermaid: https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js

  # count
  busuanzi: https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js

  # background effect
  canvas_ribbon: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/canvas-ribbon.min.js
  canvas_fluttering_ribbon: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/canvas-fluttering-ribbon.min.js
  canvas_nest: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/canvas-nest.min.js

  lazyload: https://cdn.jsdelivr.net/npm/vanilla-lazyload/dist/lazyload.iife.min.js
  instantpage: https://cdn.jsdelivr.net/npm/instant.page/instantpage.min.js
  typed: https://cdn.jsdelivr.net/npm/typed.js/lib/typed.min.js
  pangu: https://cdn.jsdelivr.net/npm/pangu/dist/browser/pangu.min.js

  # photo
  fancybox_css: https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.css
  fancybox: https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js
  medium_zoom: https://cdn.jsdelivr.net/npm/medium-zoom/dist/medium-zoom.min.js

  # snackbar
  snackbar_css: https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.css
  snackbar: https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.js

  # effect
  activate_power_mode: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/activate-power-mode.min.js
  fireworks: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/fireworks.min.js
  click_heart: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/click-heart.min.js
  ClickShowText: https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/click-show-text.min.js

  # fontawesome
  fontawesome: https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free/css/all.min.css

  # Conversion between Traditional and Simplified Chinese
  translate: https://cdn.jsdelivr.net/npm/hexo-theme-butterfly@3.8.4/source/js/tw_cn.min.js # /js/tw_cn.js

  # justifiedGallery
  justifiedGallery_js: https://cdn.jsdelivr.net/npm/justifiedGallery/dist/js/jquery.justifiedGallery.min.js
  justifiedGallery_css: https://cdn.jsdelivr.net/npm/justifiedGallery/dist/css/justifiedGallery.min.css

  # aplayer
  aplayer_css: https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.css
  aplayer_js: https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.js
  meting_js: https://cdn.jsdelivr.net/gh/metowolf/MetingJS@1.2/dist/Meting.min.js

  # Prism.js
  prismjs_js: https://cdn.jsdelivr.net/npm/prismjs/prism.min.js
  prismjs_lineNumber_js: https://cdn.jsdelivr.net/npm/prismjs/plugins/line-numbers/prism-line-numbers.min.js
  prismjs_autoloader: https://cdn.jsdelivr.net/npm/prismjs/plugins/autoloader/prism-autoloader.min.js

修改完成后可以 f12->源代码->网页 看看是否已经加载到对应的资源