Updating php version causes whitescreen of death

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== Solved ==

Update: fixed it. The issue was caused by 2 lines of code in my config.php file.

**== Solved ==**

Hey all,

I am working on this website for a family member. The website is okay for visitors performance wise, but always when I go to the wp-admin section it takes very long to load. The same for when navigating from one are to the other in the WordPress backend.

Now I read about ways to make it faster, and one way is to update the php version. So I went into the hosting providers system and updated from 7.4 to 8.0. But then the website gave a whitescreen of death. Both backend and frontend.

What is the best way to figure out what causes this?

Hope someone can give me a tip to fix this in a smart way.

Thanks!!

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