Template parts loading... Site Editor impossibly slow about sb HOT 4 CLOSED

Well, I think this particular problem has gone away - template parts are now displayed differently

But I do have problems with the Site Editor hanging, with Gutenberg 13.1.0

It's painfully slow both in my SiteGround hosting - Chrome's now locked up on this screen capture -
and locally, where I get a WSOD; 12 errors in the Chrome console, starting with
edit.js:66 Uncaught TypeError: Cannot read properties of undefined (reading 'tinymce')
at edit.js:66:51
at Hm (react-dom.js?ver=5.9.3:1:214245)
at HTMLUnknownElement.g (react-dom.js?ver=5.9.3:1:47905)
at Object.An (react-dom.js?ver=5.9.3:1:48230)
at $n (react-dom.js?ver=5.9.3:1:49191)
at qm (react-dom.js?ver=5.9.3:1:214783)
at unstable_runWithPriority (react.js?ver=5.9.3:1:20757)
at ss (react-dom.js?ver=5.9.3:1:93777)
at jm (react-dom.js?ver=5.9.3:1:213973)

from sb.

30 seconds for a mouse move is a bit much!

from sb.

In my latest tests, in s.b/wp55 with WordPress 6.0, the Classic block is producing a slightly different version of the Uncaught TypeError: Cannot read properties of undefined (reading 'tinymce') message.

Uncaught TypeError: Cannot read properties of undefined (reading 'tinymce')
    at block-library.js?ver=016c65731f009ca1e5b5974727017d18:5514:29
    at invokePassiveEffectCreate (react-dom.js?ver=17.0.1:23517:22)
    at HTMLUnknownElement.callCallback (react-dom.js?ver=17.0.1:3942:16)
    at Object.invokeGuardedCallbackDev (react-dom.js?ver=17.0.1:3991:18)
    at invokeGuardedCallback (react-dom.js?ver=17.0.1:4053:33)
    at flushPassiveEffectsImpl (react-dom.js?ver=17.0.1:23604:11)
    at unstable_runWithPriority (react.js?ver=17.0.1:2764:14)
    at runWithPriority$1 (react-dom.js?ver=17.0.1:11306:12)
    at flushPassiveEffects (react-dom.js?ver=17.0.1:23477:16)
    at performSyncWorkOnRoot (react-dom.js?ver=17.0.1:22299:5)
react-dom.js?ver=17.0.1:20115 The above error occurred in the <ClassicEdit> component:

    at ClassicEdit (https://s.b/wp55/wp-includes/js/dist/block-library.js?ver=016c65731f009ca1e5b5974727017d18:5487:5)
    at Edit (https://s.b/wp55/wp-includes/js/dist/block-editor.js?ver=39c7981dd22ec80281080455892940e6:12918:5)
...

This problem is probably covered by WordPress/gutenberg#23086

The Classic block in question is the [bw_list] shortcode in the sequentially-biased.html template part.

<!-- wp:heading {"level":4}  -->
<h4>Sequentially Biased</h4>
<!-- /wp:heading -->

[bw_list post_type=bigram posts_per_page=16 orderby=date order=DESC exclude=0]

This particular instance could be reworked to use the shortcode block or even the query loop.

from sb.

The problem with the Classic block failing has now been resolved in Gutenberg 15.3.1 or WordPress 6.2-beta5.
See WordPress/gutenberg#48938

With the latest changes to the Site Editor the performance is also much better.

Closing therefore.

from sb.