Why the broadcast from the phone Xiaomi Redmi to the TV slows down or hangs down – a full analysis of the reasons

Introduction: When Smartphone and TV “don’t find a common language”

You try to stream a video with Xiaomi Redmi on the big screen, but the picture is constantly “slowing down”, the sound lags, and sometimes the connection is completely cut off? The problem is familiar to many owners of smartphones brand — especially when using the functions of Miracast, Google Cast or Screen Mirroring via Wi-Fi Direct. 80% of the lags are not due to “curved hands”, but due to technical nuances that can be eliminated without contacting the service.

In this article, we will discuss 7 key reasons why broadcasting from Redmi Note 10/11/12, POCO X3/X4 or other line models can slow down - from banal network congestion to hidden MIUI firmware settings.

Spoiler: Half the time, you just need to change one setting in your phone or router, and let's start with the obvious -- but often ignored.

1.Cross Wi-Fi network: the main culprit of lags

Wireless screen broadcasting requires a stable communication channel with a bandwidth of at least 15-20 Mbps. If your router simultaneously distributes Internet to 10 devices, torrents are running or updates are downloading, lags are inevitable, and the problem is relevant even for the flagship Redmi K50 or POCO F4.

How do you check? Run a speed test on your phone (like a Speedtest) at the same time as you broadcast it. If it's below 10 Mbps, the network is overloaded.

• 📶 Switch to 5 GHz. The 2.4 GHz range clogs most household devices (from microwaves to smart lamps). In your router settings, select a 5 GHz network and connect both your phone and your TV to it.
• 🔄 Change the Wi-Fi channel. In the router control panel (usually 192.168.0.1 or 192.168.1.1), find the Wireless Settings section and select the channel manually (for example, 36, 40 or 48 for 5 GHz).
• 🚫 Turn off the "extra" devices. Even a smart speaker or fitness bracelet connected to the same network can steal bandwidth.

⚠️ Note: If your TV doesn’t support 5 GHz (relevant for Xiaomi Mi models) TV By 2020, you can use a wired connection to your TV over Ethernet to reduce the Wi-Fi load.

2. Protocol incompatibility: Miracast vs. Google Cast

Xiaomi Redmi supports two main broadcast protocols:

• Miracast (built into MIUI, works without internet via Wi-Fi Direct).
• Google Cast (requires a connection to a single Wi-Fi network, used in YouTube, Netflix, etc.).

The problem is that not all TVs work equally well with both standards: for example, the 2018-2020 Samsung Smart TV can “glut” with Miracast, and the Xiaomi Mi TV A2 can “glut” with Google Cast. How do you determine which protocol is used?

Decision:

1. Try an alternative protocol. If Miracast is a lag, stream it through Google Home (for Google Cast) or vice versa.
2. Update your TV firmware. For example, LG WebOS had Miracast bugs patched in 6.0+ before version 5.0.
3. Use side-by-side applications like ApowerMirror or TeamViewer QuickSupport – they often run more stable than built-in features.

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If the broadcast stops in exactly 10 minutes, check the phone's power saving settings. MIUI can default to Wi-Fi Direct to save battery. Turn off this option in Settings → Battery → Energy Saving Mode → Background Restrictions

3. performance limitations in MIUI: hidden settings

Xiaomi aggressively optimizes MIUI firmware to save battery, sometimes resulting in artificially limited Wi-Fi bandwidth during broadcast, especially on models with Snapdragon 6xx processors (such as the Redmi Note 10 Pro or POCO X3 NFC).

How to check:

1. Activate Developer Mode: Go to Settings → About Phone → MIUI version and tap 7 times on this item.
2. Go back to Settings → More → For developers and find:

• 🔧 Limit background traffic – turn off.
• 🔧 Optimization MIUI — Turn it off (may be called) MIUI Optimization).
• 🔧 Adaptive brightness – turn off (sometimes affects performance) GPU).

After the changes, restart your phone and try broadcasting again. If the lags have decreased, the problem was with software optimization.

⚠️ Attention: Disconnection MIUI Optimization can lead to increased battery consumption and overheating. Use this method only for broadcast, then return the settings back.

Hardware Limitations: Why Redmi 9 Lags Stronger Than Redmi K60

Not all Xiaomi smartphones are equally good at broadcasting.

• 📱 Budget models (Redmi) 9/9A/9C, POCO M3) They use Helio Gxx or Snapdragon processors. 4xx, Those who can't physically encode real-time video without lags.
• 📱 Mid-size segment (Redmi Note) 10/11, POCO X3/X4) broadcast 720p, but 1080p will slow down.
• 📱 Flagships (Redmi) K50, POCO F4 GT) broadcast 4K No problem, but only with the right settings.

Solutions for weak devices:

• 🎯 Reduce the resolution of the broadcast. In the Miracast settings (or third-party application), select 720p instead 1080p.
• 🔄 Use the cable. USB-C adapter USB-C → HDMI (cost ~500₽). This will eliminate lagas completely, but will limit mobility.
• ⚡ Close all background applications. Even Telegram or VKontakte in the background can steal CPU resources.

Close all applications in the background|Selecting permission 720p|Turn off energy saving|Connect to 5 GHz Wi-Fi|Use a wired adapter (optional)-->

5.Television problems: why Mi TV or Samsung aren't "pulling" the broadcast

If the lags only appear with a particular TV, the problem may be on his side.

• 📺 Outdated firmware. For example, Xiaomi Mi TV 4A PatchWall below version 3.0 has bugs with Miracast.
• 📺 Weak processor. Budget TVs (e.g., low-end TVs, TCL 4-series) may not be able to decode the flow.
• 📺 Conflict with other devices: If you have a set-top box, sound bar or game console connected to the TV HDMI, They can “interfer” with wireless transmission.

How to diagnose:

1. Try to stream to another TV (or a Miracast-enabled laptop), and if there are no lags, the problem is the TV.
2. Update the TV firmware through Settings → Support → Software Update.
3. Reset your TV network settings: Settings → Network → Reset settings.

⚠️ Attention: On Samsung TVs 2016-2019 Years of release may need to disable the function "Auto-optimization of the image" (Settings) → General. → External device → Auto-optimization. It sometimes conflicts with streaming.

6 Codec Problems: Why Videos "Tear Up" and Sound Lags

Broadcasting the screen involves encoding the video in real time, and if the phone and TV use different codecs (e.g. H.264 vs. H.265), artifacts or lags may appear, especially when viewing:

• 🎬 High-resolution video (1080p60 or 4K).
• 🎮 Gambling process (e.g, PUBG Mobile or Genshin Impact).
• 📱 Screens with animations (for example, transitions to MIUI TikTok).

Decisions:

• 🔧 Force the codecs. In Settings. → Additionally. → For developers, find the items: Video codecs - select H.264 (Best compatible video. Bitrate video - reduce to 8-10 Mbit/s.
• 🔄 Use third-party apps with manual codec configuration, such as ApowerMirror (allows you to select) H.264 or MPEG-4). Screen Stream Mirroring (supported by the VP8 Google Cast).

Critical: On some Redmi models (like the Note 8 Pro), the built-in Miracast uses default H.265 codecs that are not supported by older TVs. Forced change to H.264 solves the problem 90% of the time.

7. firmware bugs: when only reset or rollback helps

If you tried everything, but you still have lags, the problem could be the firmware of your phone or your TV.

• 🐞 MIUI 13/14 on the Redmi Note 11 There is a Wi-Fi Direct bug that causes the broadcast to be interrupted. 5-10 minute.
• 🐞 PatchWall on Xiaomi Mi TV lower 4.0 mishandle 1080p50/60.
• 🐞 Android security update from 2023 put restrictions on background Wi-Fi, affecting Miracast.

What to do:

1. Update your phone and TV to the latest version.
2. If the problem has occurred after the update, try to roll back to the previous version of MIUI via Settings → About Phone → System Update → Three Points → Select the Service Pack.
3. Do a network reset on your phone: Settings → Network and Internet → Reset settings Wi-Fi, mobile network and Bluetooth.
4. In extreme cases, make a complete reset of the phone (do not forget to save the data!).

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Before resetting your firmware, check if the manufacturer is blocking the rollback. For example, on the Redmi K40 and a newer rollback on the older version of MIUI can lead to a bootloader block.

FAQ: Frequent questions about lags when broadcasting