BlancYour Phone Isn't Broken — Photos Is Reindexing 100,000 Pictures
You restored to a new phone, or finally imported a decade of photos, and now the thing runs like it's ten years old. Warm to the touch. Battery gone by mid-afternoon. Music stops when you switch apps. Search finds nothing, and the People album is empty even though it was full on your old device.
That combination is specific enough to name. Photos is rebuilding its index, and on a large library that is genuinely enormous amount of computation. The phone is fine. But the way iOS schedules the work means a lot of people spend weeks in this state without ever letting it complete.
What it's actually doing
Photos doesn't just store pictures. For every image in the library it builds a thumbnail set, and then runs analysis on the full-resolution original: detecting and clustering faces, classifying scenes and objects for search, reading text, computing what feeds Memories and the For You tab.
That analysis is why you can type 'receipt' or 'beach' and get results, and it is expensive — on-device machine learning, per photo. It doesn't transfer between devices, so a restore doesn't bring it along: the new phone has your photos immediately and has to earn everything else from scratch. On 100,000 items this is days of processing, not hours.
Why it never seems to finish
iOS deliberately refuses to do this work while you're using the phone. It runs when the device is locked, on power, and reasonably cool — and it backs off immediately when any of those stop being true.
Which creates a loop that catches almost everyone. The phone feels slow, so you pick it up to check on it. Picking it up pauses the work. You put it down, it resumes, you check again an hour later. If your phone is rarely locked and charging for long stretches, the job can make almost no progress across an entire week — and the symptoms persist the whole time, which makes it feel like a permanent fault rather than a queue.
Heat compounds it. A hot phone throttles, and throttling stops the analysis first. In a warm room, or in a case, on a wireless charger, you can spend a full night charging and get very little done.
How to confirm this is what's happening
- Open Photos → Search and look for a status line, or check the bottom of the Library view. During indexing, Photos sometimes states outright that it's preparing or analysing, with a count.
- Check the People album. If it's empty or has very few faces on a library that used to have dozens, face clustering hasn't run yet. This is the clearest single indicator.
- Search for a common object — 'dog', 'car', 'menu'. No results on a large library means scene classification is incomplete.
- Settings → Battery. If Photos is near the top of the usage list, it is doing exactly what this article describes.
- The timing fits. This starts within a day of a restore, migration, large import or major iOS update, and not out of nowhere.
If none of that matches — no restore, People album fine, search working — this isn't your problem, and it's worth checking whether something more mundane is going on with storage instead.
What actually helps
Give it three uninterrupted nights. Plugged into a cable rather than a wireless charger, out of its case, screen down on something that isn't a bed or a sofa, on Wi-Fi, untouched. Wireless charging generates the exact heat that stops the work, so this detail matters more than it sounds.
Turn off Low Power Mode. It suspends this work completely, along with iCloud Photos sync. If your battery is low enough that Low Power Mode is effectively always on, nothing will progress until the phone is charging.
Let the iCloud download finish first, if there is one. Analysis runs on originals. If your library is still pulling full-resolution files down, indexing is waiting behind that queue — and if the download itself is stalled, it may never get started at all.
Make sure there's free space. Thumbnails and analysis caches need somewhere to go, and a phone at 99% full will stall this indefinitely while giving you no indication why.
Then check the People album every couple of days. Faces appearing is real evidence of progress, and it's more reliable than how fast the phone feels.
What makes it worse
Resetting the library, deleting and reinstalling apps, or toggling iCloud Photos off and on all discard partial progress and start the work over — while feeling like decisive action. Each restart costs you whatever the previous nights accomplished.
Toggling iCloud Photos carries a second risk that has nothing to do with speed: on a library still mid-sync it can remove local copies of photos whose originals never uploaded. That failure mode is worth reading about before you touch the setting, because it's not recoverable.
One genuinely reasonable option, if the phone is unusable and you don't need the features: Settings → Siri → Photos, and turn off the analysis-driven suggestions. You lose people, scene search and Memories, and you get the processing time back. Most people would rather wait three nights, but it's a legitimate trade.
Why it took days in the first place
The processing time scales with the number of photos, and that number is mostly made of things nobody would choose to keep: burst duplicates, screenshots of things long since dealt with, twelve versions of one moment. A library half the size finishes in half the time — and syncs more reliably, backs up faster, and stops filling the phone.
Culling it is thousands of small decisions, which is why it stalls: people get partway, stop, and start from the beginning next time. Blanc fixes that one thing by remembering every decision you've made, so short sessions accumulate. Deleting photos fast without regretting it covers the mechanics if you'd rather do it by hand.