Same growth here, on 17.0.24 and macOS 27.0.1, but in DisplayLinkPrivilegedHelper rather than the user agent.
Environment
- MacBook Pro Mac16,7, Apple M4 Pro, 24 GB RAM
- macOS 27.0.1 (26A434)
- DisplayLink Manager 17.0.24
- Dock: "USB3.0 5K Graphic Docking" (DisplayLink), three Dell P2425 at 1920x1200, extended
After 6 days 2 hours of uptime (the helper has run since boot):
- DisplayLinkPrivilegedHelper: footprint 5466 MB, peak 5466 MB. top shows MEM 5402M, CMPRS 5399M, so almost all of it is sitting in the compressor.
- vmmap --summary: MALLOC zones total 5.4 GB, 5.3 GB allocated across 52,617,169 live allocations. Heap, not graphics buffers.
- DisplayLinkUserAgent: 603 MB, 414 MB compressed. DisplayLinkXpcService: 5 MB.
- Growth is about 0.9 GB per day.
Restarting the helper gives the memory back without a reboot (sudo launchctl kickstart -k system/com.displaylink.DisplayLinkManager.PrivilegedHelpe r), the displays blink for a second. I have filed ticket CSMUSV-321 through the support portal with the Support Tool output attached.
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