This doesn’t seem like a very appropriate forum for this, but it’s by far the least wrong place to post this.
I have found 2 more issues/PRs that demonstrate this problem but I can’t post more than 2 links per post.
These pages load for 15 seconds and then return an error saying “this page is taking too long to load”.
This is not a one-time thing - I have been unable to access these specific issues for about 3 days. Most other issues in that repo are fine, but I don’t know how many others are affected by this problem.
If you have another issue/PR that references one of these, hovering over the link causes a preview to be displayed normally. Example: https://github.com/vis2k/Mirror/pull/1048