github.com
The Github website is extremely slow on Safari #170758
Excerpt
### Body Over the past few months, Github has been getting slower and slower on Safari. It has now reached a point where it is unusable. Displaying any pull request with more than a thousand lines changed or even browsing any file with a thousand or more lines of code is fully broken. What happens: - In Activity Monitor, the rendering process is running at 100%. - Rendering the page is so slow, Safari displays blank space when scrolling up and down. - Any interactive features like search is so slow it doesn't work. - Pull request review is extremely painful (scrolling back and forth is impossible to do quickly, posting comments is extremely slow, even checking the "Viewed" checkbox sometimes takes several seconds, etc.). ā¦ ### LeLunZ Aug 25, 2025 ... For bigger PRs I can't edit anything or press on any buttons. Seems like such a big page breaks something? I just tried it from a current branch to a really old version of one of my projects, and there are 403 commits and 855 changed files. In such a case the GitHub UI becomes completely unusable. ā¦ ### BrentMifsud Aug 25, 2025 ... Even small PRs I can't do anything. Adding reviewers, adding labels, etc... every action on the page takes many seconds. The page often locks up as well. This wasnt an issue a few weeks ago. - š 3 3 replies ... As someone who writes bugs for a living I'm careful to complain. That said, this has become a real pain point for me, personally. It's not uncommon for me to do the following things opening a PR: - Changing the base branch - Writing the description - Toggling the create button between draft and ready to review - Assigning reviewers - Assigning myself I do this several times a day and within the last few weeks the page will lock up *every* time. Sometimes I'll refresh the browser and even that takes a while to perform. Historically I've had no issues with this in Safari. 0 replies ā¦ #### lukehefson Aug 28, 2025 ... > This lines up with my experience. Initially the new files experience seemed to improve things, but in the last week, I've noticed the changed files feature is unbelievably sluggish. I can barely scroll through more than a few hundred lines of change, and the page locks up. Yeah it's definitely the files experience. But I've also noticed sluggishness all around the past week or so. For example: In any comment box, when you start to type something that autocompleted (like an @mention), the character rendering slows riiiiight doooooown. ā¦ #### uson1x Aug 27, 2025 - Wow I did not know this problem was only in safari. ... It did get faster with latest PR review UI update, but still rather slow right now - š 2