One UI 8.5 Apps Slow or Not Opening? Here's the Real Fix

 

You tap an app after updating to One UI 8.5 and... nothing. It just sits there loading. Or it finally opens a few seconds later and feels broken — buttons don't respond right, things freeze mid-use. You're not imagining it. Samsung's own community forums have been flooded with the same complaint this week: apps slow to load or just not functioning after the 8.5 update, across S24, S24 Ultra, Z Fold7, and more. 

Some people restart and it's fine. Others factory reset and it's somehow worse. Here's what's actually causing it and the exact order to try fixes in — starting with the one that solves it for most people without wiping anything.

Why This Actually Happens

  • Every major One UI update forces every app on your phone to re-optimize in the background — this is normal and can genuinely cause slowness for the first 24–48 hours
  • If the slowness doesn't fade after a couple of days, it usually points to one of a few specific culprits: a corrupted app cache carried over from the old software, one misbehaving app dragging the whole system down, storage running too full for Android to manage RAM properly, or — less commonly — a problem with an SD card
  • Samsung has acknowledged the wider lag and stuttering complaints and is actively working on a patch, but most individual cases can be fixed right now without waiting for that

1. Give It 24–48 Hours Before Doing Anything Drastic

Before troubleshooting anything, rule out the most common (and most temporary) cause.

  • Go to Settings > Battery and Device Care > Optimize now, then restart the phone
  • This lets background re-indexing finish, which resolves most temporary slowness
  • Still broken after 2 full days? Move to step 2

2. Clear Cache (Not Data) on the Affected App

This is the safest fix to try first — it clears out corrupted leftovers from the update without touching anything you'd have to log back into.

  • Settings > Apps > the app that's frozen or slow
  • Tap Storage > Clear Cache only — this keeps your logins and data intact
  • Reopen the app and test before trying anything more aggressive

3. Boot Into Safe Mode to Isolate the Cause

This is the step Samsung support itself is recommending in the forums right now — it tells you in minutes whether the OS or a third-party app is to blame.

  • Hold Power > long-press Power Off > tap Safe Mode
  • Only pre-installed apps run in Safe Mode — all third-party apps are disabled
  • Samsung apps work fine here? A third-party app is the cause — reboot normally and uninstall recently updated apps one at a time
  • Samsung apps still broken here? The issue is deeper — continue to the next steps

4. Check Your Storage

A phone running low on space struggles to manage RAM properly, which shows up as exactly this kind of app lag.

  • Settings > Battery and Device Care > Storage
  • Free up space if you're above roughly 90% full
  • Delete unused apps, clear duplicate photos, or back up to the cloud

5. Remove Your SD Card (If You Use One)

Samsung support has quietly flagged SD cards as a known drag on performance after this update, so it's worth ruling out even if it seems unrelated.

  • Unmount first: Settings > Device Care > Storage > More options > Storage settings > SD card > Unmount
  • Remove the card and use the phone without it for a day
  • Samsung support has flagged certain SD card files as a known drag on performance post-update

6. Update Every App Through the Galaxy Store and Play Store

Developers push compatibility fixes for major OS updates, but only if you actually update the apps.

  • Open both stores > Manage/My Apps > update everything, not just the one app giving you trouble
  • Apps not yet updated for One UI 8.5 are more likely to lag or crash

7. If Nothing Works, Run Diagnostics Before You Reset

Before you consider wiping the phone, this step rules out an actual hardware fault in under a minute.

  • Open Samsung Members app > Support tab > run built-in diagnostics
  • This checks for an actual hardware issue a factory reset won't fix
  • Multiple forum users who reset first reported the problem came right back — diagnostics save you that wasted step

Frequently Asked Questions

Q. 1: Will a factory reset fix apps that are slow or not opening after One UI 8.5?

Not always. Several users who reset their phone reported the same issues returned immediately, since the update itself — not their data — is often the cause. Try Safe Mode and cache clearing first.

Q. 2: Is this affecting all Galaxy phones or just certain models?

Reports are widespread across S24, S24 Ultra, Z Fold7, and other recent models, so it isn't limited to one device — but not every phone is affected, which points to app-level or storage-level triggers rather than a universal hardware issue.

Q. 3: How long does post-update slowness normally last?

Give it 24–48 hours for background optimization to finish. If it's still happening after that, treat it as a bug to troubleshoot, not something to wait out.

Q. 4: Has Samsung acknowledged this problem?

Yes — Samsung support has responded to multiple threads about One UI 8.5 lag and performance issues and is working on a fix, though no dedicated patch has shipped yet as of this week.

Final Thoughts

Most of the panic around this bug comes from people jumping to a factory reset before ruling out the simpler causes — and forums are full of cases where that reset didn't even help. Working through cache clearing, Safe Mode, and storage checks in order will solve this for the vast majority of people without losing a single photo or app login.

If you've already gone through 6 Hidden One UI 8.5 Shortcuts to get more out of the update, this is the natural next step — making sure the update actually runs smoothly before you lean into the new features. And if apps stay broken after everything here, it's worth checking whether your device is due for Samsung's next security patch, since Samsung often rolls stability fixes in alongside security ones.

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