According to [this report](https://gtmetrix.com/reports/gitlab.com/57l7nHlc) which comes from [this hacker news comment](https://news.ycombinator.com/item?id=11177001) we should be deferring the loading of JS. To fix this we can follow the [given document](https://gtmetrix.com/defer-loading-of-javascript.html). cc @DouweM @JobV @sytses