Intro animation completely breaks Lighthouse

[hschne]

What happened?

It's common practice to verify the performance of your page using Lighthouse/Google Page Speed Insights. Unfortunately, the report is completely broken with the Minimal Mistakes theme.

Expected behavior

It would be nice to have this working. I'm pretty sure that wasn't always the case, and I assume that Google changed something or other 🤷

Steps to reproduce the behavior

You can verify this easily enough with the Minimal Mistakes homepage.

1. Go to https://pagespeed.web.dev
2. Enter https://mmistakes.github.io/minimal-mistakes/ there
3. Wait
4. Receive a broken performance report.
   

Other

I traced the issue to $intro-animations on main. Disabling the animation fixes the problem.

$global-transition: none;
$intro-transition: none;

@import "minimal-mistakes/skins/{{ site.minimal_mistakes_skin | default: 'default' }}";
@import "minimal-mistakes";

I'm not sure what the best fix there is. Google uses page speed for SEO ranking, so this not working may be fairly impactful. However, I don't know if it warrants disabling animations altogether.