A design company created test sites full of super-annoying issues, such as slow load times, auto-play music, and pop-ups, then measured how much each increased people’s blood pressure.

It’s a devil’s bargain to be a tech tester. Sure, you get to see the latest and greatest things, but you also are essentially being digitally poked and prodded to measure everything. This new study by Cyber Duck UX Agency out of the UK went further with digital torture to measure stress levels.