Thanks for your suggestions, I looked into journalctl:
Aug 22 16:02:36 $hostname plasmashell[17334]: BRefreshApplicationsInLibrary 1: 103ms
Aug 22 16:02:47 $hostname plasmashell[31049]: fsync: up and running.
Aug 22 16:02:47 $hostname plasmashell[31049]: wine: RLIMIT_NICE is <= 20, unable to use setpriority safely
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#20 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=139s
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#20 Sense Key : Not Ready [current]
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#20 Add. Sense: Medium not present - tray closed
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#20 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#21 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 0, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#22 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 1, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#23 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 2, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#29 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 3, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#30 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 4, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#0 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 5, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#1 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 6, async page read
Aug 22 16:02:47 $hostname kernel: sr 2:0:0:0: [sr0] tag#2 unaligned transfer
Aug 22 16:02:47 $hostname kernel: I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Aug 22 16:02:47 $hostname kernel: Buffer I/O error on dev sr0, logical block 7, async page read
Aug 22 16:04:00 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/InhibitionHint.qml:27:5: QML Label: Binding loop detected for property "verticalAlignment"
Aug 22 16:04:30 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/InhibitionHint.qml:27:5: QML Label: Binding loop detected for property "verticalAlignment"
Aug 22 16:04:33 $hostname plasmashell[17334]: /bin/sh\0-c\0/home/$username/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=413150 -- /home/$username/.local/share/Steam/ubuntu12_32/steam-launch-wrapper -- '/mnt/games/SteamLibrary/steamapps/common/Stardew Valley/StardewValley' STEAM_RUNTIME=0\0
Aug 22 16:04:33 $hostname plasmashell[31252]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Aug 22 16:04:33 $hostname plasmashell[31252]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
Aug 22 16:04:33 $hostname plasmashell[31253]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Aug 22 16:04:33 $hostname plasmashell[31253]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Aug 22 16:04:33 $hostname plasmashell[31254]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Aug 22 16:04:33 $hostname plasmashell[31255]: /mnt/games/SteamLibrary/steamapps/common/Stardew Valley/StardewValley: line 7: sw_vers: command not found
Aug 22 16:04:33 $hostname plasmashell[31255]: pid 31255 != 31253, skipping destruction (fork without exec?)
Aug 22 16:04:33 $hostname plasmashell[31256]: ERROR: ld.so: object '/home/$username/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Aug 22 16:04:35 $hostname plasmashell[31256]: NoFpsCap: This feature is not available
Aug 22 16:04:35 $hostname rtkit-daemon[946]: Supervising 13 threads of 6 processes of 1 users.
Aug 22 16:04:35 $hostname rtkit-daemon[946]: Supervising 13 threads of 6 processes of 1 users.
Aug 22 16:04:35 $hostname rtkit-daemon[946]: Supervising 13 threads of 6 processes of 1 users.
Aug 22 16:04:35 $hostname rtkit-daemon[946]: Successfully made thread 31276 of process 31256 owned by '1000' high priority at nice level -15.
Aug 22 16:04:35 $hostname rtkit-daemon[946]: Supervising 14 threads of 7 processes of 1 users.
Aug 22 16:04:36 $hostname plasmashell[31256]: setGameMode( 'titleScreenGameMode (0)' )
Aug 22 16:04:36 $hostname plasmashell[31256]: loadPreferences(); begin - languageCode=
Aug 22 16:04:36 $hostname plasmashell[31256]: savePreferences(); async=False, languageCode=en
Aug 22 16:04:36 $hostname plasmashell[31256]: [S_API] SteamAPI_Init(): Loaded '/home/$username/.local/share/Steam/linux64/steamclient.so' OK.
Aug 22 16:04:36 $hostname plasmashell[31256]: Setting breakpad minidump AppID = 413150
Aug 22 16:04:36 $hostname plasmashell[31256]: SteamInternal_SetMinidumpSteamID: Caching Steam ID: 76561197975977949 [API loaded no]
Aug 22 16:04:36 $hostname plasmashell[31256]: Steam logged on: True
Aug 22 16:04:36 $hostname plasmashell[31256]: Initializing GalaxySDK
Aug 22 16:04:36 $hostname plasmashell[31256]: Requesting Steam app ticket
Aug 22 16:04:36 $hostname plasmashell[31256]: loadPreferences(); begin - languageCode=
Aug 22 16:04:36 $hostname plasmashell[31256]: savePreferences(); async=False, languageCode=en
Aug 22 16:04:36 $hostname plasmashell[31256]: loadPreferences(); begin - languageCode=en
Aug 22 16:04:36 $hostname plasmashell[31256]: Window_ClientSizeChanged(); Window.ClientBounds={X:640 Y:869 Width:1280 Height:720}
Aug 22 16:04:36 $hostname xembedsniproxy[1044]: Container window visible, stack below
[here: over 50000 times the line "Container window visible, stack below"]
Aug 22 16:05:08 $hostname xembedsniproxy[1044]: Container window visible, stack below
Aug 22 16:05:08 $hostname kwin_x11[962]: OpenGL vendor string: AMD
Aug 22 16:05:08 $hostname kwin_x11[962]: OpenGL renderer string: AMD Radeon RX 6800 XT (navi21, LLVM 15.0.7, DRM 3.49, 6.1.44-1-MANJARO)
Aug 22 16:05:08 $hostname kwin_x11[962]: OpenGL version string: 4.6 (Compatibility Profile) Mesa 23.1.5
Aug 22 16:05:08 $hostname kwin_x11[962]: OpenGL shading language version string: 4.60
Aug 22 16:05:08 $hostname kwin_x11[962]: Driver: Unknown
Aug 22 16:05:08 $hostname kwin_x11[962]: GPU class: Unknown
Aug 22 16:05:08 $hostname kwin_x11[962]: OpenGL version: 4.6
Aug 22 16:05:08 $hostname kwin_x11[962]: GLSL version: 4.60
Aug 22 16:05:08 $hostname kwin_x11[962]: Mesa version: 23.1.5
Aug 22 16:05:08 $hostname kwin_x11[962]: X server version: 1.21.1
Aug 22 16:05:08 $hostname kwin_x11[962]: Linux kernel version: 6.1.44
Aug 22 16:05:08 $hostname kwin_x11[962]: Requires strict binding: yes
Aug 22 16:05:08 $hostname kwin_x11[962]: GLSL shaders: yes
Aug 22 16:05:08 $hostname kwin_x11[962]: Texture NPOT support: yes
Aug 22 16:05:08 $hostname kwin_x11[962]: Virtual Machine: no
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMAPPLIST_INTERFACE_VERSION001 / AppList
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMAPPS_INTERFACE_VERSION008 / Apps
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMHTMLSURFACE_INTERFACE_VERSION_005 / HTMLSurface
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMHTTP_INTERFACE_VERSION003 / HTTP
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMINVENTORY_INTERFACE_V003 / Inventory
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMMUSICREMOTE_INTERFACE_VERSION001 / MusicRemote
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMMUSIC_INTERFACE_VERSION001 / Music
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMPARENTALSETTINGS_INTERFACE_VERSION001 / ParentalSettings
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMREMOTEPLAY_INTERFACE_VERSION001 / RemotePlay
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMREMOTESTORAGE_INTERFACE_VERSION016 / RemoteStorage
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMSCREENSHOTS_INTERFACE_VERSION003 / Screenshots
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMUGC_INTERFACE_VERSION015 / UGC
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMUSERSTATS_INTERFACE_VERSION012 / UserStats
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface STEAMVIDEO_INTERFACE_V002 / Video
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamController008 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamFriends017 / Friends
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamInput005 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamInput005 / Controller
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamMatchGameSearch001 / GameSearch
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamMatchMaking009 / Matchmaking
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamMatchMakingServers002 / MatchmakingServers
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamNetworking006 / Networking
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamNetworkingMessages002 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamNetworkingSockets009 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamNetworkingUtils003 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamParties002 / Parties
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamUser021 / User
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamUtils010 /
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 created interface SteamUtils010 / Utils
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientNetworkingUtilsSerialized::GotLocationString : 2
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientNetworkingSocketsSerialized::GetSTUNServer : 2
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientNetworkingSocketsSerialized::GetCachedRelayTicketCount : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientNetworkingSocketsSerialized::GetCertAsync : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientHTTP::ReleaseHTTPRequest : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientHTTP::GetHTTPResponseBodyData : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientHTTP::SendHTTPRequest : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientHTTP::SetHTTPRequestHeaderValue : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientHTTP::CreateHTTPRequest : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUtils::RecordSteamInterfaceCreation : 32
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUtils::GetAPICallResult : 5
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUtils::GetAppID : 35
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUtils::GetServerRealTime : 3
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientFriends::GetPersonaName : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUser::GetEncryptedAppTicket : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUser::RequestEncryptedAppTicket : 1
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUser::GetSteamID : 2
Aug 22 16:05:08 $hostname plasmashell[17334]: Game 413150 method call count for IClientUser::BLoggedOn : 2
Aug 22 16:05:08 $hostname plasmashell[17334]: Uploaded AppInterfaceStats to Steam
Aug 22 16:05:08 $hostname kwin_x11[962]: GlideConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: BlurConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: ZoomConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: WindowViewConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: SlidingPopupsConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: SlideConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: OverviewConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: KscreenConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname kwin_x11[962]: DesktopGridConfig::instance called after the first use - ignoring
Aug 22 16:05:08 $hostname plasmashell[1608]: ATTENTION: default value of option mesa_glthread overridden by environment.
Aug 22 16:05:08 $hostname plasmashell[1608]: ATTENTION: default value of option mesa_glthread overridden by environment.
Aug 22 16:05:09 $hostname gameoverlayui[31300]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Aug 22 16:05:19 $hostname plasmashell[17334]: reaping pid: 31300 -- gameoverlayui
Aug 22 16:05:32 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/InhibitionHint.qml:27:5: QML Label: Binding loop detected for property "verticalAlignment"
Aug 22 16:05:32 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/TextItemDelegate.qml:20: TypeError: Cannot read property 'slice' of undefined
Aug 22 16:05:32 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/TextItemDelegate.qml:20: TypeError: Cannot read property 'slice' of undefined
Aug 22 16:06:01 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/InhibitionHint.qml:27:5: QML Label: Binding loop detected for property "verticalAlignment"
Aug 22 16:06:31 $hostname plasmashell[1012]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/InhibitionHint.qml:27:5: QML Label: Binding loop detected for property "verticalAlignment"
I guess it has to do with “xembedsniproxy[1044]: Container window visible, stack below”, which appeared over 50,000 times in the log. Though xembedsniproxy “only” uses 3.4% of the CPU, while plasmashell is around 8%.
I found a bug tracker that states it might have to do with either icons or how multiple monitors are set up. I will try to investigate further, but a solution that allows my preferred monitor configuration and usual apps would be preferable.
It’s also interesting that the same monitor configuration and tray icons don’t cause issues when using proton.
Edit: Yeah OK that’s just great. If the two monitors are configured in a way their top edges align, then there is no lag at all. Unfortunately, on my desk, the bottom edges are aligned (and one is a bit taller) so I’d like to configure them as such. Is there a way to do that? Or do I have to basically wait for a fixed version to be released?