[Website] Clicking around wp-admin with WordPress 7.0 RC1 leads to render slowness

[brandonpayton]

It takes a lot of clicking around on my Macbook Pro, but in latest Chrome, clicking around the WordPress 7.0 RC1 in the Playground website leads to rendering slowness. An admin screen appears blank but eventually renders. Then subsequent clicks to other pages in the admin menu lead to slowly rendering the next page.

Here is a video. The rendering issues appear near the 0:48 mark.

Screen.Recording.2026-03-25.at.11.39.18.PM.mov

Note: There is an "Unlock 1Password" overlay that is apparently stuck in the middle of the video. That happens sometimes in other pages and seems like a 1Password extension bug rather than a clue for this case. But maybe it's possible it could be a symptom of the underlying issue. I don't plan to consider that for now, but it would be good not to conclusively assume they are unrelated.

[fellyph]

Hi @brandonpayton,

I have done a few tests with Playground CLI and playground.wordpress.net.

1. Running Playground CLI with WP 7.0 RC2 for 2 minutes, clicking on different pages quickly to reproduce the issue. But I couldn't reproduce the issue running with Playground CLI.
2. Running playground.wordpress.net with WP 7.0 RC2, a few clicks, the playground crashed.
3. Running playground.wordpress.net with WP 6.9.4, I was clicking on links for a minute, no issue at all. When I switch to WP 7.0, it crashes.

Test 1
https://github.com/user-attachments/assets/a6da986f-0940-4cf0-8b34-6128b497533c

Test 2
https://github.com/user-attachments/assets/6e45c3a5-45bf-4173-ab5c-1d2c78a6e54e

Test 3