High CPU usage and laggy on Fedora 40

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What Operating System(s) are you seeing this problem on?

Linux X11

Which Wayland compositor or X11 Window manager(s) are you using?

awesomewm

WezTerm version

wezterm 20240203-110809-5046fc22

Did you try the latest nightly build to see if the issue is better (or worse!) than your current version?

Yes, and I updated the version box above to show the version of the nightly that I tried

Describe the bug

I see a higher CPU usage on Fedora 40 and it becomes laggy when there's a lot of terminal output.

To Reproduce

• Fedora 40
• AwesomeWM
• execute journalctl and hold down key
• Output stuttering

Configuration

local wezterm = require "wezterm";

local config = {}

-- In newer versions of wezterm, use the config_builder which will
-- help provide clearer error messages
if wezterm.config_builder then config = wezterm.config_builder() end

config.mouse_bindings = {
	{ event = { Up = { streak = 1, button = "Left" } }, mods = "NONE", action = wezterm.action.Nop },
	{ event = { Up = { streak = 1, button = "Left" } }, mods = "CTRL", action = "OpenLinkAtMouseCursor" }
 }

config.freetype_load_flags = "DEFAULT"

config.disable_default_key_bindings = true
config.keys = {
	{ key = "L", mods = "CTRL", action = wezterm.action.ShowDebugOverlay },
	{ key = "w", mods = "CTRL", action = wezterm.action { CloseCurrentPane = { confirm = false } } },
	{ key = "t", mods = "CTRL", action = wezterm.action { SpawnTab = "CurrentPaneDomain" } },
	{
		key = "t",
		mods = "CTRL|SHIFT",
		action = wezterm.action_callback(
			function( win, pane )
				local tab, window = pane:move_to_new_tab()
				tab:activate()
			end
		 )
	 },

	{ key = "n", mods = "CTRL", action = "SpawnWindow" },
	{
		key = "n",
		mods = "CTRL|SHIFT",
		action = wezterm.action_callback(
			function( win, pane )
				pane:move_to_new_window()
				-- tab:activate()
			end
		 )
	 },
	{ key = "p", mods = "CTRL|SHIFT", action = "ShowLauncher" },
	{ key = "d", mods = "CTRL", action = wezterm.action.SplitVertical },
	{ key = "o", mods = "CTRL", action = wezterm.action.ActivatePaneDirection "Next" },
	{ key = "g", mods = "CTRL", action = wezterm.action.ActivateTabRelativeNoWrap( -1 ) },
	{ key = "h", mods = "CTRL", action = wezterm.action.ActivateTabRelativeNoWrap( 1 ) },
	{ key = "o", mods = "CTRL|SHIFT", action = wezterm.action.ActivatePaneDirection "Prev" },
	{ key = "e", mods = "CTRL", action = wezterm.action.SplitHorizontal },
	{ key = "c", mods = "CTRL|SHIFT", action = wezterm.action.CopyTo "Clipboard" },
	-- { key = "c", mods = "CTRL|SHIFT", action = wezterm.action.CopyTo "PrimarySelection" },
	{ key = "v", mods = "CTRL|SHIFT", action = wezterm.action.PasteFrom "Clipboard" },
	-- { key = "v", mods = "CTRL|SHIFT", action = wezterm.action.PasteFrom "PrimarySelection" },
	{ key = "f", mods = "CTRL|SHIFT", action = wezterm.action { Search = { CaseSensitiveString = "" } } },
	-- {
	-- 	key = "C",
	-- 	mods = "CTRL",
	-- 	action = wezterm.action.Multiple { CopyTo = "ClipboardAndPrimarySelection" }
	--  },
	{ key = "V", mods = "CTRL", action = wezterm.action.PasteFrom "Clipboard" }
 }

-- config.use_fancy_tab_bar = false
config.tab_bar_at_bottom = true
config.use_fancy_tab_bar = false

config.window_frame = {
	font = wezterm.font { family = "Hack Nerd Font", weight = "Regular" },
	font_size = 10.0,
	active_titlebar_bg = "#16161e",
	inactive_titlebar_bg = "#16161e"
 }
config.window_padding = { left = 10, right = 10, top = 10, bottom = 10 }

config.color_scheme = "Catppuccin Mocha"

config.font = wezterm.font { family = "Hack Nerd Font", weight = "Regular" }

config.font_size = 10.0

return config

Expected Behavior

Wezterm should consume less CPU and be much smoother

Logs

Debug Overlay
wezterm version: 20240203-110809-5046fc22 x86_64-unknown-linux-gnu
Window Environment: X11 awesome
Lua Version: Lua 5.4
OpenGL: AMD Radeon RX 6700 XT (radeonsi, navi22, LLVM 18.1.1, DRM 3.57, 6.8.7-300.fc40.x86_64) 4.6 (Compatibility Profile) Mesa 24.0.6
Enter lua statements or expressions and hit Enter.
Press ESC or CTRL-D to exit
11:27:49.532 WARN window::os::x11::connection > Unable to resolve appearance using xdg-desktop-portal: get_appearance.read_setting: Reading xdg-portal org.freedesktop.appearance color-scheme: org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.Settings” on object at path /org/freedesktop/portal/desktop
11:40:50.663 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)
11:41:18.233 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)
14:27:28.967 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)
16:31:49.084 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)
16:32:15.647 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)
16:32:36.479 ERROR wezterm_mux_server_impl::local > writing pdu data buffer: Broken pipe (os error 32)

Anything else?

No response

[rwese]

Hi @ad-on-is, could you please format your config as a codeblock, also the log output, this would help readability.

[ad-on-is]

Done... I'd suggest to update the template, if that's possible, since I copy&pasted the code into the corresponding fields.

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Additional info... I just found this happens, when I have one window running btop, and another window running neovim.

Steps to reproduce

• Open one window and run btop (with graph symbol braille)
• Open another window and open a larger file in neovim
• Scroll through the file in neovim
• Result: laggy