ModelMenuPanel mounts a ModelEditSubmenu per model row, and each body ran
its hooks and built its JSX eagerly on menu open — ~90 rows of switches,
radio groups, and preset lookups nobody hovered yet, the largest app-code
slice in the open-latency profile. Wrap the body in a child component under
SubContent so Radix's presence gate leaves it unrendered until the submenu
actually opens; open latency drops roughly in half on a 91-model catalog.
Brooklyn Nicholson
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