⚡ Bolt: Optimize MediaGalleryView sorting and rendering#500
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- Replace `localeCompare` with raw string comparison for ISO dates to reduce O(n log n) overhead. - Wrap `filtered` list in `useMemo` to prevent redundant O(n) filtering on re-renders. - Hoist `search.toLowerCase()` outside of the `.filter` loop to prevent redundant allocations per row.
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| allMedia.sort((a, b) => { | ||
| if (!a.createdAt && !b.createdAt) return 0; | ||
| if (!a.createdAt) return 1; | ||
| if (!b.createdAt) return -1; | ||
| return b.createdAt.localeCompare(a.createdAt); | ||
| return b.createdAt > a.createdAt | ||
| ? 1 | ||
| : b.createdAt < a.createdAt | ||
| ? -1 | ||
| : 0; | ||
| }); |
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Potentially Incorrect Date Sorting
The sorting logic for allMedia uses raw string comparison on the createdAt field:
return b.createdAt > a.createdAt ? 1 : b.createdAt < a.createdAt ? -1 : 0;This approach assumes that all createdAt values are in a consistent, lexicographically sortable format (such as ISO 8601). If any createdAt values are in a different format or are malformed, the sort order may be incorrect, leading to unexpected results in the media gallery.
Recommended Solution:
- Ensure that all
createdAtvalues are normalized to a consistent format (preferably ISO 8601) before sorting. - Alternatively, parse the dates using
Date.parse()ornew Date()for comparison:allMedia.sort((a, b) => { const dateA = Date.parse(a.createdAt); const dateB = Date.parse(b.createdAt); return dateB - dateA; });
- Handle invalid or missing dates explicitly to avoid NaN results.
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Code Review
This pull request optimizes performance in the MediaGalleryView component by replacing localeCompare with raw string comparison for sorting timestamps and wrapping the filtered list in useMemo to prevent redundant re-renders. I have provided a suggestion to further refine the useMemo logic by hoisting the search condition and simplifying the filtering flow for better readability and efficiency.
| const filtered = useMemo(() => { | ||
| const searchLower = search?.toLowerCase() ?? ""; | ||
| return media.filter((m) => { | ||
| if (filter !== "all" && m.type !== filter) return false; | ||
| if ( | ||
| searchLower && | ||
| !m.filename.toLowerCase().includes(searchLower) && | ||
| !m.url.toLowerCase().includes(searchLower) | ||
| ) | ||
| return false; | ||
| return true; | ||
| }); | ||
| }, [media, filter, search]); |
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The useMemo block can be further optimized for performance and clarity. Since search is initialized as a string, the optional chaining and nullish coalescing are redundant. Additionally, the searchLower check can be hoisted outside the filter call to avoid repeated checks inside the loop. For very large lists, you might also consider pre-calculating lowercase values or using a case-insensitive regex to avoid repeated .toLowerCase() calls on item properties.
| const filtered = useMemo(() => { | |
| const searchLower = search?.toLowerCase() ?? ""; | |
| return media.filter((m) => { | |
| if (filter !== "all" && m.type !== filter) return false; | |
| if ( | |
| searchLower && | |
| !m.filename.toLowerCase().includes(searchLower) && | |
| !m.url.toLowerCase().includes(searchLower) | |
| ) | |
| return false; | |
| return true; | |
| }); | |
| }, [media, filter, search]); | |
| const filtered = useMemo(() => { | |
| const searchLower = search.toLowerCase(); | |
| if (!searchLower) { | |
| return filter === "all" ? media : media.filter((m) => m.type === filter); | |
| } | |
| return media.filter((m) => { | |
| if (filter !== "all" && m.type !== filter) return false; | |
| return ( | |
| m.filename.toLowerCase().includes(searchLower) || | |
| m.url.toLowerCase().includes(searchLower) | |
| ); | |
| }); | |
| }, [media, filter, search]); |
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💡 What
Optimizes the
MediaGalleryViewcomponent by converting a heavy string comparison to raw comparisons and adding memoization.🎯 Why
localeCompareincurs substantial CPU overhead compared to simple operator-based raw string comparisons (>,<). Furthermore, computing thefilteredlist via.filter()directly inside the component body incurs an O(n) penalty on every re-render, compounding with redundant.toLowerCase()conversions for every iteration.📊 Impact
localeCompareoverhead.filteredlist is skipped on unrelated state updates.search.toLowerCase()executions by hoisting it outside the filter callback.🔬 Measurement
Load the media gallery with numerous items. The sorting phase should be visibly faster (via profiler), and interacting with UI elements (like typing in the search bar or changing filters) will exhibit lower CPU utilization and avoid unnecessary re-allocations on re-renders.
PR created automatically by Jules for task 15748526540224851990 started by @Dexploarer