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7a43b928a6
As in content trees with 10 thousand of directories and more.
A benchmark with the bottle neck code in `helpers.ExtractAndGroupRootPaths`:
```
│ cmp20251125.bench │ fix-extractandgrouproot-14211.bench │
│ sec/op │ sec/op vs base │
ExtractAndGroupRootPaths-10 1282818.8µ ± 8% 493.8µ ± 38% -99.96% (p=0.002 n=6)
│ cmp20251125.bench │ fix-extractandgrouproot-14211.bench │
│ B/op │ B/op vs base │
ExtractAndGroupRootPaths-10 3343.8Ki ± 0% 146.3Ki ± 0% -95.63% (p=0.002 n=6)
│ cmp20251125.bench │ fix-extractandgrouproot-14211.bench │
│ allocs/op │ allocs/op vs base │
ExtractAndGroupRootPaths-10 20.043k ± 0% 2.979k ± 0% -85.14% (p=0.002 n=6)
```
For test project that started this (a 60k directory conent tree), the server startup with no rendering, wen from 1.5 minutes to less than 4 seconds:
```
hugop server --renderSegments none main ✚ ✖ ✱ ◼
Watching for changes in /Users/bep/dev/sites/hugotestsites/60k/content/{section0,section1,section10,section100,section101,section102,section103,section104,section105,section106,...}
Watching for changes in /Users/bep/dev/sites/hugotestsites/60k/layouts/_default
Watching for config changes in /Users/bep/dev/sites/hugotestsites/60k/config.toml
Start building sites …
hugo v0.153.0-DEV-7e27c303904ed8b221d6a5a4fc9a764bb7b2935b darwin/arm64 BuildDate=2025-11-25T15:02:58Z
│ EN
──────────────────┼────
Pages │ 0
Paginator pages │ 0
Non-page files │ 0
Static files │ 0
Processed images │ 0
Aliases │ 0
Cleaned │ 0
Built in 3884 ms
Environment: "development"
Serving pages from disk
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at //localhost:1313/ (bind address 127.0.0.1)
Press Ctrl+C to stop
```
Note that the output may be a little different and a little more verbose than before., but the information is correct and this implementation is significantly faster and simpler.
Fixes #14211