Miracast at 5 GHz performance
Miracast at 5 GHz performance
I frequently transfer films from my laptop to a TV but notice stuttering and visual issues. It seems the main constraint might be either the standard or the 2.4 GHz bandwidth, or perhaps the TV's Wi-Fi module. If both devices can handle 5 GHz, could we somehow route them through it?
Determine the specifications of your television and the laptop's Wi-Fi adapter model.
This requires some preparation from your side along with a basic understanding of your router or access point. I’ve turned off the 2.4Ghz radio on your router, which gives you flexibility since you can change settings separately on many devices. Sign in to your router and try pairing both radios using different SSIDs. Once connected, any devices you want can use whichever radio you prefer.
For TV it's the LG 42LB650V, which likely works with 802.11n. The WiFi module is AX210. Upgrading your router to 5GHz might help, but Miracast does connect them directly without needing extra hardware.
Your TV should support connecting to WiFi on the 5GHz band, though performance will be restricted to wireless-N (WiFi 4) speeds. After reviewing some information, it appears Miracast starts with a 2.4GHz connection and might switch to 5GHz if possible. Ensure your network isn’t being disrupted by neighbors. Unfortunately, Windows 10 offers limited customization for hotspots or Miracast; it defaults to a 20MHz bandwidth, giving you roughly 100-150Mbps. You’ll likely need to keep the broadcast range small. For testing, run the command `netsh int tcp show global` in the command prompt to see the current TCP settings.
TCP Global Settings Overview - Key Features Explained
Receive-side scaling is active. Auto-tuning works at the normal level. Congestion control uses the default ECN method. Timestamps are turned off. Recovery time objective is set to 1000 ms. Segment coalescing is enabled. No SACK-based retransmission handling.
RFC 1323 timestamps are disabled. The initial RTO is 1000 ms. Direct connections (no router) are limited to 2.4GHz; higher frequencies require a router, which can help offload traffic. Upgrading your router might improve performance and reduce lag, but it depends on your specific setup.
Execute the command to turn off the RSC control and restart the system... It's uncertain if this will succeed. However, if you're using a wireless router that only operates on the 2.4GHz band, upgrading to a WiFi 5 or newer device would be a major improvement. To fully remove streaming delays, an Ethernet connection is unmatched. On one of my older smart TVs with WiFi only, I connected the Amazon Fire Stick via its Ethernet adapter; although it doesn't support full gigabit speeds, 100Mbps is sufficient for streaming and casting without any lag. Also, I don't rely on Miracast—streaming through my WiFi network performs well for both 1080p and 2160p content.