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Tailwindmarkup~8 mins

Place items alignment in Tailwind - Performance & Optimization

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Performance: Place items alignment
LOW IMPACT
This affects the browser's layout and paint phases by controlling how items align within a container, impacting rendering speed and visual stability.
Aligning items both horizontally and vertically inside a grid container
Tailwind
<div class="grid place-items-center"><div></div></div>
Using place-items-center combines horizontal and vertical alignment in one CSS property, reducing layout recalculations.
📈 Performance Gaintriggers 1 reflow per alignment update
Aligning items both horizontally and vertically inside a grid container
Tailwind
<div class="grid justify-items-center items-center"><div></div></div>
Using separate justify-items-center and items-center classes causes the browser to calculate alignment in two steps, potentially triggering multiple layout recalculations.
📉 Performance Costtriggers 2 reflows per alignment update
Performance Comparison
PatternDOM OperationsReflowsPaint CostVerdict
Separate justify-items-center and items-centerMinimal2 reflowsLow[!] OK
Single place-items-centerMinimal1 reflowLow[OK] Good
Rendering Pipeline
The place-items property sets both align-items and justify-items in one step, reducing the number of style calculations and layout passes needed.
Style Calculation
Layout
Paint
⚠️ BottleneckLayout
Core Web Vital Affected
CLS
This affects the browser's layout and paint phases by controlling how items align within a container, impacting rendering speed and visual stability.
Optimization Tips
1Use combined CSS properties like place-items to reduce layout recalculations.
2Avoid applying separate justify and align classes when a single combined class exists.
3Minimize layout thrashing by grouping related style changes.
Performance Quiz - 3 Questions
Test your performance knowledge
Which Tailwind class combination is more performance-friendly for aligning items both horizontally and vertically?
Aplace-items-center
Bjustify-items-center items-center
Cjustify-start items-end
Dplace-content-center
DevTools: Performance
How to check: Record a performance profile while resizing or updating alignment. Look for layout (reflow) events triggered by style changes.
What to look for: Fewer layout events and shorter layout durations indicate better performance with combined place-items usage.