Karma Tests Reporting Fast Runs, But Actually Running Slow

This is best explained with a video (or see the gif below): You'll notice that the Karma progress reporter is reporting that the tests are taking milliseconds, but it's obviously

Solution 1:

Edit: This seems to no longer be an issue. You should be fine to use Chrome these days.

The problem is similar to this issue. However, it looks like Chrome needs to be in the foreground (maybe a recent change?)... I don't see the problem in Firefox.

So, the solution is to use Firefox instead.

However, if Chrome needs to be used specifically, you can read another question I posted to address getting around this issue.