Individual skill
list-virtualization
Use when reviewing dashboards, admin tables, search results, or feeds with many repeated items. Confirm the bottleneck is DOM or rendering cost before introducing virtualization because small lists usually do not need the added complexity.
skills/list-virtualization/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
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- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 74,706
- Repository last updated
- Oct 31, 2026
- License
- MIT
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- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- engineering Derived category
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SKILL.mdcore · 2,210 bytesSKILL.mdcore · 2,210 bytesreferences/rule.mddoc · 3,214 bytes
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# Virtualize long lists and tables
Rendering hundreds or thousands of rows at once wastes memory and makes style calculation, layout, and painting more expensive. Virtualization keeps large collections responsive by limiting the number of mounted nodes.
## Quick Reference
- Render only what is visible plus a small overscan buffer instead of the entire list
- Use virtualization when repeated rows or cards push DOM size and layout cost too high
- Preserve item sizing, keyboard access, and screen-reader semantics when windowing content
- Measure scroll smoothness, memory use, and DOM node count before and after the change
## Check
Inspect long lists, tables, grids, and feeds for places where the UI renders every item at once. Flag views where the number of mounted rows or cards is large enough to create DOM, memory, or scroll-performance issues.