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WPCOM's style variation load in the site editor feels much slower than core's #75795

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Description

Quick summary

When comparing how style variation options load in the site editor (in Global styles, e.g.) on DotCom vs on another kind of self-hosted site (Jurassic Ninja, e.g.), DotCom's feels slower.

Compare this on a Jurassic Ninja site:
style_load_core

To this DotCom simple site:
style_load_non_edge_15-5

I noticed this especially because the 15.6 rc-1 adds the style variations to the menu sidebar, and the performance especially stands out there:
style_load_edge_menu_sidebar

Steps to reproduce

Repeat on a Jurassic Ninja site and a WPCOM simple site:

  1. Activate a theme with style variations (like twenty twenty three)
  2. Go to site editor and open global styles
  3. Click on "style variations" and watch them load in

What you expected to happen

They load in snappy-like

What actually happened

They feel more sluggish on DotCom

Impact

Most (> 50%)

Available workarounds?

Yes, easy to implement

Platform (Simple and/or Atomic)

Simple

Logs or notes

No response

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