Why the phone book on Xiaomi Redmi 8 Pro is slowing down – a full analysis of the causes and solutions

You open your phone book on your Redmi. 8 Pro, does it hang for a few seconds, slowly scrolling or does not respond at all to the pressing? 2-3 Unlike new Xiaomi models, where performance is optimized for modern versions. MIUI, Redmi 8 Pro (issued in 2019 Over time, it starts to slow down when working with contacts.

In this article, we're not just going to list the standard tips like "clean the cache," but we're going to look at 7 key reasons why a phone book can be lagging, from hardware limitations to sync errors with a Google Account or Mi Cloud. You'll learn how to diagnose a problem, what settings to change first, and when to think about resetting the system. And for those who don't want to dig through the menu, we've prepared an exclusive 5-step checklist to speed up contacts quickly.

1. Overloaded memory: why contacts "suffocate" in the background

Redmi 8 Pro is equipped with everything 4 GB RAM (in the basic version) and 64/128 GB ROM, which by modern standards is not enough for smooth operation MIUI 12/13. A phone book is not just a list of names; it is constantly interacting with the phone:

• 📞 Call log (keeps call history)
• 📧 Synchronization (Google, Mi Cloud, WhatsApp)
• 🔍 Search index (for quick contact search)
• 🤖 Background processes (optimization) MIUI, auto-refresh)

If RAM is less than 1 GB, the system starts to kill background tasks, but the phone book itself (com.android.contacts) remains a priority - hence the lag. → The phone. → Status of the system → Memory.

⚠️ Note: If you see in the Memory section that system processes are more than 50% of RAM, this is a sign of a memory leak, in which case only rebooting or resetting the cache through Recovery will help.

Decisions:

1. Close all background applications (swipe up in the recent task menu).
2. Turn off autosynchronization for unnecessary accounts (Settings) → Accounts. → Synchronization).
3. Clear the phone book cache: Settings → Annexes → Application management → Contacts → Warehouse → Clear the cache.

Synchronization errors: when contacts “conflict” with each other

Redmi 8 Pro supports synchronization of contacts with:

• 🌐 Google Account (via Google Contacts)
• ☁️ Mi Cloud (Xiaomi Cloud)
• 💬 WhatsApp/Messenger (duplicate)
• 📱 SIM-map (obsolete format)

If you have multiple sources synced in your settings, the phone book gets tangled in duplicates, for example, the same contact can be stored simultaneously in Google, Mi Cloud and on the phone. SIM-The system tries to verify all versions every time it opens a book, so the delays are there.

How to check:

1. Open Contacts. → ⋮ (menu) → Contact management → Merger and split.
2. If there are duplicates, manually remove them or use the “Combine” function.
3. Check how many synchronization sources are active: Settings → Accounts. → Synchronization of contacts.

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If the phone book is still slowing down after cleaning the takes, try temporarily shutting down the Internet and opening contacts offline, and if the lags are gone, the synchronization problem is exactly the problem.

3.Outdated version MIUI: Why updates can slow down the work

The Redmi 8 Pro was originally designed for MIUI 10 (based on Android 9), but over time received updates to MIUI 12.5 (Android 11). Each new version MIUI adds background processes to:

• 🛡️ Security (virus scanning, application verification)
• 🔄 Optimizations (auto-cleaning of memory, battery management)
• 🎨 Designs (animations, dark theme, widgets)

The problem is that these "improvements" are designed for more powerful smartphones. MIUI 12+ Deep Optimization is a feature that should speed up the system, but often backfires on weak devices, especially when working with contacts.

How to check the MIUI version:

1. Go to Settings → About Phone → MIUI version.
2. If version is older than 12.5.3, check for updates (Settings) → Updating the system).
3. If there are no updates, but the lags remain – try to roll back to an older version. MIUI (for example 11.0.3).

⚠️ Attention: Firmware rollback erases all data! Before the procedure, make a backup through Settings → Additionally. → Backup and reset.

4.Damaged contact details: when the base "breaks down"

If the phone book starts to slow down after:

• ⚡ Updates MIUI
• 🔄 Transferring contacts from another phone
• 🗑️ Hand-cleaning cache

— There is a high probability that the contact database is damaged (contacts2.db). This file stores all your numbers, and if there are errors in it, the system spends additional resources on fixing them on the fly».

Signs of damaged base:

• Contacts are not displayed in full (for example, no names, only numbers).
• Searching the phone book is delayed or does not find existing contacts.
• When the book opens, a message appears: “Contact application is stopped.”

How to restore the base:

1. Export contacts to the file VCF: Contacts → ⋮ → Contact management → Exports/imports → Export to the vault
2. Clear the data of the application Contacts and Contact Warehouse: Settings → Annexes → Application management → Contacts → Warehouse → Clear the data
3. Import contacts back from the file VCF.

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If your contacts are gone after cleaning, don't panic! VCF, You exported it in the first step. Just import it back.

5. Third-party apps conflict: Who is in the way of the phone book?

Many applications request access to contacts, but not all of them work correctly, especially problems caused by:

• 🔒 Antivirus (Avast, 360 Security) – scan contacts in the background.
• 📊 Optimizers (Clean Master, DU Speed Booster – aggressively cleans the cache, breaking the database.
• 💰 Banking applications (SberBank, Tinkoff) – create backup copies of contacts for security.
• 🎮 Playing with social functions (PUBG, Free Fire – can copy contacts to invite friends.

How to find the "culprit":

1. Launch your phone in Safe Mode (press the power button) → long tap on "Switch off» → «Safe regime»).
2. Check if the phone book is slowing down in this mode. If not, the problem is in a third-party app.
3. Return to normal mode and turn off access to contacts for applications: → Confidentiality → Permits → Contacts

The most “voracious” applications according to users of Redmi 8 Pro:

Hardware restrictions: when iron does not pull MIUI

The Redmi 8 Pro is built on a Qualcomm Snapdragon 655 processor, which is not the weakest, but also the most productive chip, and over time, its capabilities become insufficient for:

• 📱 Handling thousands of contacts (if you have more than 1,000 records).
• 🔄 Instant synchronization with clouds.
• 🎨 Animation. MIUI (smooth transitions, effects when scrolling).

If all software methods have been tried, but the phone book still slows down, radical measures remain:

1. Disable animations: Settings → The phone. → Version. MIUI (Tap 7 times to turn on developer mode → Additionally. → For developers → Scale of window/transition animation = Off.
2. Install a light firmware (e.g. Pixel Experience based on Android 10).
3. Reset your phone to factory settings (last chance before replacing the device).

⚠️ Warning: Installing custom firmware will void warranty and may cause a phone to break down, only if you are confident in your actions or under the guidance of an experienced user.

Clear the cache of the Contacts application|Disable autosynchronization with Mi Cloud|Remove duplicate contacts|Disable animations in the developer settings|Reboot the phone-->

7. Alternative solutions: when nothing helps

If you’ve tried everything but your phone book is still unstable, consider these options:

• 📱 Use a third-party phone book: Apps like Simple Contacts or Contapps are faster than a standard phone book MIUI, because they do not carry unnecessary functions.
• ☁️ Move contacts to the cloud: If you are actively using Google Contacts, try opening them through your browser (contacts.google.com) – this will unload your phone.
• 🔧 Replace the memory module: In rare cases, lags are caused by the degradation of flash memory (especially if the phone overheats frequently.

For those who are ready to experiment, there is another way to disable the system application Contacts and use only Google Contacts, but this requires root rights and can disrupt other functions (such as call logs).

Instructions for experienced users:

1. Get root access (for example, through Magisk).
2. Install Titanium Backup or App Inspector.
3. Find the com.android.contacts app and freeze it.
4. Install Google Contacts from Play Market as your primary app.

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Before any manipulation with system applications, make a full backup through TWRP or MIUI Without a backup, you risk losing all contacts!

FAQ: Frequent questions about the phone book lags on Redmi 8 Pro