Public bug reported:
When viewing the desktop exported via x11vnc, refresh rates are slow.
1.) This happens irrespective of client / client machine (Remmina,
TightVNC viewer, RealVNC viewer), so it's not the client.
2.) iperf shows 900mbps+ bandwidth between clients and server (gigE
wired connection).
3.) Refresh rate gets worse as screen resolution increases (HD is
reasonably usable, say 500ms between refreshes based on looking at
gkrellm graphs, but 4K is more like 3 seconds between redraws).
4.) It does not do this if logged in to a Mate desktop, leading me to
believe it's XFCE, not x11vnc.
5.) This worked fine on 18.04, at 4k - no discernable lag. Everything
else remains the same, just this was updated from 18.04 to 20.04.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xubuntu-desktop 2.233
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Mon Aug 17 00:21:10 2020
SourcePackage: xubuntu-meta
UpgradeStatus: Upgraded to focal on 2020-08-12 (4 days ago)
** Affects: xubuntu-meta (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal third-party-packages
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https://bugs.launchpad.net/bugs/1891841
Title:
x11vnc refresh is slow when using XUbuntu desktop
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