Fritter is much more lightweight than Twitter's web app.
Also, if you are using a browser that supports extensions (such as a desktop browser or Fennec F-Droid[1]), the Privacy Redirect extension will redirect all Twitter requests to Nitter:
https://github.com/SimonBrazell/privacy-redirect
[1] Instructions for enabling custom extensions on Firefox Nightly or forks of Firefox on Android: https://blog.mozilla.org/addons/2020/09/29/expanded-extensio...