The phone is very slow on Android: what to do if the smartphone has become like a “brick”

Has your Android smartphone suddenly started to “think” about every action? Applications take 10 seconds to open, animations are jerky, and the keyboard appears with a delay? This doesn't always mean it's time to buy a new phone. In 80% of cases brakes on Android caused by software problems that can be solved independently - without visiting a service center and without losing data.

We analyzed hundreds of user complaints on the forums (from owners Samsung Galaxy to budget Redmi) and compiled a checklist of effective solutions. Important: if the phone starts to slow down after a fall, moisture or overheating, first check the hardware condition - software optimization will not help here. In all other cases, follow our instructions in order: from simple methods to radical ones.

1. Diagnostics: why your Android smartphone has become slow

Before clearing the cache or resetting settings, determine source of brakes. Here are the key symptoms and their causes:

• 🔋 The phone slows down when the battery is low (below 15%) → the culprit is the energy saving mode, which limits performance.
• 📱 Lags when opening specific applications (for example, Instagram or Google Maps) → problem in the application itself or lack of RAM.
• 🔄 Slowdown after updating Android → the new OS version may not be optimized for your model.
• 🚀 The phone freezes for 5-10 seconds, then works normally → symptom overloaded storage or fragmented memory.

For accurate diagnostics, use the built-in tools:

1. Open Settings → Device maintenance (on Samsung) or Settings → Battery (on other brands).
2. Check the section "CPU Usage" - if some application is constantly loading the processor on 50%. data-i="69">📊 What slows down your phone the most?
3. Run Settings → Memory and see how much free space is left on the internal storage.

2. Free up random access memory (RAM)

RAM (random access memory) —the main performance bottleneck. If it is not enough, Android begins to forcefully close background processes, which causes freezes. The norm for modern smartphones:

• 📱 2–3 GB of RAM —enough for social networks and instant messengers, but games and multitasking will be slow.
• 📱 4–6 GB of RAM —optimal for most tasks.
• 📱 8 GB+ RAM —needed only for heavy games or professional applications (for example Adobe Premiere Rush).

How to free up RAM:

1. Close all applications via "Recent" button → “Close all” (on some firmware - swipe up with a delay).
2. Disable autostart of unnecessary applications:

   Settings → Applications → Three dots (⋮) → Autostart

   Disable autostart for all applications except instant messengers and system services.

3. Use lite versions of applications (for example, Facebook Lite, Messenger Lite).

3. Clearing cache and garbage: what can be deleted without risk

Application cache and system garbage take up to 5–10 GB memory on old smartphones. Clearing them will not delete your data (photos, messages), but can speed up the phone by 30–50%. Cleaning methods:

Data type	How to clear	Risk of data loss
Application cache	Settings → Storage → Cache data → Clear	No
Google Play Services cache	Settings → Applications → Google Play Services → Storage → Clear cache	No (but you may need to sign in to your Google account again)
Residual files	Applications like CCleaner or Files by Google	Low (check what you delete)
System garbage (thalium, log files)	Only through ADB or engineering menu (for experienced)	High (may break the system)

⚠️ Attention: Do not clear the cache for WhatsApp, Telegram and banking applications - this may delete unsent messages or authorization data.

Delete the cache of unnecessary applications (for example, games that have not been launched for a long time)|Clear the cache Google Play Market and Google Play Services|Check the folder Download for unnecessary files|Use the built-in optimizer (on Samsung — Device Care, on Xiaomi — Security)-->

4. Storage optimization: what takes up space and how to free it

If there is less than 10% free spaceon the phone, Android starts to slow down due to memory fragmentation. Check what is taking up space:

1. Go to Settings → Storage.
2. Click on a category (for example, “Applications”, “Images”) for a detailed analysis.
3. Delete:

• 🎮 Unused games (especially heavy ones: Genshin Impact - 15 GB+, PUBG - 3 GB+).
• 📸 Duplicate photos (use Google Photos → “Free space” → “Remove duplicates”).
• 🎥 Cache of streaming services (YouTube, Netflix, TikTok —can take up to 5 GB).
• 📄 Downloaded files from messengers (the folder Download is often filled with memes and documents).

💡 Advice for owners Samsung: Enable the function Settings → Device maintenance → Auto-optimization. It automatically cleans garbage once a week.

How to find hidden heavy files?

Open a file manager (for example, Files by Google) → go to the "Analysis" section storage" → sort files by size. Often forgotten 4K videos or application backups are found there.

5. Software update and firmware rollback

If the phone starts to slow down after updating Androidthe unoptimized firmware is to blame. Manufacturers often release “crude” updates that slow down older models. What to do:

1. Check that the firmware is up to date:

   Settings → System → System update

   If a new update is available, install it (perhaps bugs from the previous version have been fixed).

2. Rollback to a previous version of Android:
   • For Samsung: use the app Odin + official firmware from the site Sammobile.
   • For Xiaomi: download the old version of MIUI from en.miui.com and flash through Fastboot.
   • For Pixel: use Android Flash Tool from Google.

⚠️ Attention: Rolling back firmware erases all data from your phone. First make a backup copy via Settings → Google → Backup copy or Titanium Backup (root required).

💡

If after the update the phone starts to slow down, wait 24-48 hours. Android optimizes the system in the background (a process called "dexopt") and performance should be restored.

6. Factory reset: when you really need it

Hard Reset —an extreme measure that helps in 95% of cases of severe brakes. It is worth doing it if:

• 🐢 The phone slows down even after clearing the cache and freeing up memory.
• 🔄 A failure occurred after flashing or rooting.
• 🦠 You suspect a virus (for example, advertising appears in random places).

How to reset settings without data loss:

1. Make a backup:

   Settings → Google → Backup → Start copying

   (contacts, photos, some application settings will be saved).

2. Perform a reset:

   Settings → System → Reset → Delete all data

3. After reboot, restore the data from the backup.

⚠️ Attention: On phones with MediaTek chip (many Redmi, Realme, Tecno), the reset may block the bootloader. Before the procedure, check whether OEM Unlock is unlocked Settings → For developers.

7. Radical methods: root, custom firmware and battery replacement

If all else fails, remain advanced methods - but they require technical skills:

• 🔧 Obtaining root access + installation Magisk for deep optimization systems. Allows you to remove built-in bloatware (unnecessary system applications from the manufacturer).
• 📱 Installing custom firmware (for example, LineageOS or Pixel Experience). This is especially true for old phones (for example, Samsung Galaxy S7 or Xiaomi Redmi Note 4).
• 🔋 Battery replacement. If the phone slows down only when the charge is below 30% and quickly discharges, a degraded battery is to blame. On iPhone this can be diagnosed through Settings → Battery → Status, on Android - with applications like AccuBattery.

💡 For owners Samsung with a chip Exynos: Try to disable the service Knox, which consumes up to 15% of processor resources. To do this, you need root access + module Disabler for Samsung v Magisk.

How to check battery wear?

Install AccuBattery → open the “Health” tab → look at the “Wear” parameter. If it is above 30%, it is time to change the battery. On Samsung the code ##4636## → “Battery information” also works.

8. Hardware problems: when it's time to take the phone to the service

If the phone is slow even after resetting to factory settingsthe problem may be in the hardware:

Symptom	Possible reason	Solution
The phone gets hot and slows down	Thermal paste has dried out or the chip has burned out	Replacement of thermal paste (from 1500 ₽) or chip (from 5000 ₽)
Logs when connecting to Wi-Fi/4G	Problems with the communication module	Flashing the modem or replacing the antenna
The phone freezes on the logo when power on	Damaged memory (eMMC or UFS)	Replacement of memory chip (expensive, often cheaper to buy a new phone)
Lags when using the camera	Faulty camera cable	Replacement of the cable (from 2000 ₽)

⚠️ Attention: If the phone fell into water or has been subjected to strong shocks, do not try to disassemble it yourself - corrosion on the board can lead to a short circuit. In such cases, contact the service immediately.

FAQ: Frequently asked questions about brakes on Android

🔹 Why did the new phone start to slow down after a month?

Most often, background application processes are to blame (especially Facebook, TikTok, AliExpress). They aggressively cache data and load RAM. Solution: disable autorun for these applications and clear the cache once a week.

🔹 Can a virus cause slowdowns?

Yes, but rarely. Modern Android viruses disguise themselves as legitimate applications (for example, “Memory Cleaners” or “Game Boosters”). Check your phone via Malwarebytes or Kaspersky Mobile. If you find suspicious applications, uninstall and reset the settings.

🔹 Why does the phone slow down in games, but works fine in the menu?

Video games require high GPU performance. If the phone gets hot and freezes only in games, try:

1. Lower the graphic settings in the game (turn off shadows, lower the resolution).
2. Use Game Booster (built in MIUI, Realme UI).
3. Close all background applications before starting games.

If it doesn’t help, the problem is thermal throttling (overheating protection is triggered). You need to clean the phone from dust or change the thermal paste.

🔹 How to speed up old Android (4-5 years)?

For phones 2018–2019 (for example, Samsung Galaxy S8, Xiaomi Redmi Note 5):

1. Install light firmware (for example, LineageOS without GApps).
2. Disable all animations in Settings → For developers (turn on developer mode by clicking 7 times on “Build number” in Settings → About phone).
3. Use launchers like Nova Launcher or Lawnchair —they are lighter than standard ones.

🔹 Slows down after replacing the screen - what to do?

If the phone starts to lag immediately after replacing the display, the reasons may be:

• 🔌 The screen cable is poorly connected → return to the service to check.
• 📱 Non-original screen with a low refresh rate → cheap Chinese displays may have an input lag.
• 🔧 The board is damaged during disassembly → diagnostics are needed.

Try to roll back the phone to factory settings - if the brakes remain, the problem is hardware.