DisplayLink on Mac: Setup, Netflix and Performance Explained
DisplayLink is how most people get two or more monitors working on a MacBook Air. It works well, but it behaves differently from a monitor plugged straight into the Mac. Here is what to expect.
How it works in one paragraph
A DisplayLink dock has its own small graphics chip. A driver on your Mac captures the image for each extra screen, compresses it and sends it over the USB-C cable. The dock decompresses it and sends it to the monitor. Your Mac's built-in display limit no longer applies, because the Mac is not driving those screens directly.
Setting it up
- Download DisplayLink Manager from the DisplayLink (Synaptics) website, or from the link your dock maker provides.
- Install it and open it once.
- macOS will ask for Screen Recording permission for DisplayLink Manager. Allow it in System Settings; without it the extra screens stay black.
- Plug in the dock. Arrange the screens in System Settings, Displays, as usual.
Turn on "launch automatically after login" in DisplayLink Manager so the screens come back after a restart.
The Netflix problem
Copy-protected video uses HDCP, and many DisplayLink docks do not support it. Plugable's listing for its UD-6950PDH states this plainly. In practice, some streaming apps and websites show a black window on a DisplayLink screen. The fix is simple: play video on the built-in screen or on a monitor connected through the Mac's own video output.
Performance
DisplayLink uses some CPU to compress the image. With two 4K office screens on a recent Air, this is rarely noticeable. Fast motion, games and video editing on DisplayLink screens can look less smooth than a native connection. WAVLINK, whose five-screen dock we compared, recommends 16 GB of RAM for its biggest setups.
When to choose Thunderbolt instead
A Thunderbolt 4 dock passes the Mac's native video, so screens connected that way behave exactly like a direct cable, with no driver and full copy protection. On an M4 or M5 Air that already supports two displays, that may be all you need. Some docks combine both: the Satechi Thunderbolt 4 dock drives screens over Thunderbolt and adds two more through DisplayLink HDMI ports.
Summary
- Need more screens than your Air supports: DisplayLink.
- Watching films or editing video on the external screen: use a native connection for that screen.
- Want fewer compromises and fast storage too: a Thunderbolt dock, ideally one that adds DisplayLink for the extra screens.