Each time you open a project and bring up fuzzy-finder, it shows 'Indexing...' for several seconds. For large projects it's quite annoying.
Suggested solution: save per-project caches after reindex and load them on startup, delete old caches. I've implemented it in my fork here and can make a pull request, if this idea is welcome.
On my project with ≈50k files, fuzzy finder can be used immediately after startup and it saves time.