Type in the input and watch the expensive list. The bad pattern re-renders the list on every keystroke. The good pattern passes the list as children to the stateful component — React reuses the same element reference.
Item 1
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Item 2
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Item 3
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Item 1
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Item 2
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Item 3
| Product | Price | Sold |
|---|---|---|
| Wireless Headphones | $79.99 | Mar 15, 2024 |
| USB-C Hub | $34.50 | Apr 2, 2024 |
| Mechanical Keyboard | $129.00 | Jan 28, 2024 |
| Webcam 1080p | $59.99 | May 11, 2024 |
| Desk Lamp | $45.00 | Feb 19, 2024 |
| Mouse Pad XL | $22.50 | Jun 7, 2024 |
| Monitor Stand | $89.00 | Mar 30, 2024 |
| Cable Organizer | $14.99 | Jul 14, 2024 |
| Portable Charger | $49.50 | Aug 3, 2024 |
| Laptop Stand | $67.00 | Jan 10, 2024 |
| Noise Cancelling Mic | $99.99 | Sep 21, 2024 |
| Smart Plug (4-pack) | $31.00 | Oct 5, 2024 |
| HDMI Cable 2m | $12.50 | Nov 18, 2024 |
| Ergonomic Mouse | $55.00 | Dec 1, 2024 |
| LED Strip Lights | $27.99 | Feb 8, 2024 |
| Trackpad | $119.00 | Apr 25, 2024 |
| Desk Fan | $38.50 | May 30, 2024 |
| Screen Cleaner Kit | $9.99 | Jun 15, 2024 |
| Ethernet Adapter | $19.00 | Jul 22, 2024 |
| Wrist Rest | $24.50 | Aug 14, 2024 |
| Document Scanner | $149.99 | Sep 9, 2024 |
| Mini Projector | $199.00 | Oct 17, 2024 |
| Blue Light Glasses | $29.99 | Nov 3, 2024 |
| Sticky Note Dispenser | $7.50 | Dec 20, 2024 |
| Cable Clips (20-pack) | $5.99 | Jan 31, 2024 |
Browser timer resolution is ~0.1ms — individual renders below this floor display as < 0.1ms. avg aggregates across samples and can show finer precision.