# 23-Jan-2026 — cache start coordinates, lazy load GPX list, and refactor [ref: #133](https://github.com/nbarrett/ngx-ramblers/issues/133)

## [build 434](https://github.com/nbarrett/ngx-ramblers/actions/runs/21282030433) — [commit 1c591cb](https://github.com/nbarrett/ngx-ramblers/commit/1c591cb14b9878474c373d21d0cacbbcdbfc7879)

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- Add startLat/startLng fields to FileNameData and ServerFileNameData
- Extract and cache GPX start coordinates at upload time
- Use cached coordinates in list endpoint, only parsing from S3 if needed
- Process GPX files sequentially instead of Promise.all to prevent memory exhaustion
- Auto-cache coordinates on first access for existing files
- Lazy load GPX file list only when dropdown is opened (not on page load)
- Show existing GPX file name without fetching entire list
- Refactor server-side processing into smaller functions