If Viber is crawling on your Mac — messages arriving late, the interface stuttering, calls freezing — don’t blame your Mac’s age just yet. Check the timing first: if the lag started right after a macOS update, the culprit is usually a compatibility gap between the new system and the current Viber build, not dying hardware. And compatibility gaps get fixed.
Work through these steps in order: figure out the trigger, update Viber, do a clean reinstall if needed, lighten Viber’s load, and finish with Activity Monitor and a restart. Most Macs are messaging smoothly again within half an hour.
1. Pin down the trigger
Did the lag start right after a macOS update? Then it’s most likely a compatibility gap — Viber usually ships a compatible update within days or weeks of a macOS release. Did it creep in gradually with no update in sight? Then something in your setup is the likelier cause. Either way, the fix steps below overlap, so keep reading.
2. Update Viber to the latest version
Open Viber and check for updates, or download the latest build directly from viber.com. Developers routinely patch performance and compatibility bugs, and the Viber update that follows a macOS release is exactly the kind of fix that clears post-update lag. Install it, restart Viber, and give it a few minutes — if the stutter is gone, you’re done.
3. Do a clean reinstall
Still laggy? A clean reinstall clears corrupted caches and leftover files that an update won’t touch. Quit Viber completely (Viber → Quit Viber, or right-click its Dock icon → Quit), then delete the app plus its leftovers — the support folder at ~/Library/Application Support/ViberPC, or use a free uninstaller like AppCleaner to catch everything. Warning: this temporarily removes your local chat history. Your chats re-sync from your phone when you sign back in, so let the sync finish before worrying. (For keeping phone and Mac chats in step generally, see our guide to setting up message sync between iPhone and Mac.)
4. Lighten Viber’s load
Viber does plenty in the background, and on older Macs every bit helps. Turn off “Start Viber on system startup” in Viber’s settings so it isn’t competing during boot, disable animated stickers and visual effects, and archive huge media-heavy chats you don’t need open. For a calmer Mac overall, our guide to muting mail notifications for specific contacts in macOS is a good companion read.
5. Check Activity Monitor and restart the Mac
Open Activity Monitor (Applications → Utilities), sort by CPU, and if Viber or a companion process is hogging the processor, select it and quit it. Look for other CPU hogs stealing resources too. Then restart your Mac — it clears stuck processes and frees memory. Apple Support documents these maintenance steps, and MacRumors tracks known macOS performance quirks after each release.
If it still doesn’t work
If lag persists with the latest Viber and macOS after a clean reinstall, check whether Viber itself is having a bad day — widespread outages happen, and Viber’s help pages note current issues. On a Mac several generations old, heavy video calls may simply exceed what the machine handles; the Viber mobile app can be a lighter alternative for calls.
FAQ
Will reinstalling Viber delete my chats?
Temporarily, on the Mac — local chat history is removed. But chats re-sync from your phone when you sign back in. Make sure your phone’s Viber works and is up to date first.
Why does Viber lag only after macOS updates?
Major macOS updates change system frameworks apps depend on. Until the developer ships a build tuned for the new system, you get stuttering and freezes. It affects plenty of apps, not just Viber — updating the app is the fix.
Conclusion
Viber lag on macOS is almost always fixable: update the app, clean-reinstall if the update doesn’t cut it, trim Viber’s background load, and finish with Activity Monitor and a restart. Diagnose the timing first, and you’ll usually know within minutes whether you’re waiting on Viber’s next update or fixing your own setup.
