Tragic performance

[grappas]

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

Linux Wayland

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

Hyprland 0.32.3.r21.91d6be1f-1

WezTerm version

20231112-171650-721fbdf5

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

On fast changing viewport there's ~5 second input lag and same frame time. Main selling point of an app is non existent and even worse than software accelerated terminal emulators.

To Reproduce

Foot for comparison:

https://github.com/wez/wezterm/assets/1036957/fea5fb98-04fe-4cfa-a879-d66566426931

Configuration

local wezterm = require 'wezterm'
local act = wezterm.action
local mykeys = {
}

local My_font_size = 14.0
local Font_size = My_font_size

function Recompute_font_size(window)
    local window_dims = window:get_dimensions()
    local overrides = window:get_config_overrides() or {}
    local Dpi = window_dims.dpi / 96
    local Scale_factor_general = 7
    local Scale_factor_x = window_dims.pixel_width / ( Scale_factor_general * 9 * Dpi )
    local Scale_factor_y = window_dims.pixel_height / ( Scale_factor_general * 7 * Dpi )
    local Scale_factor = Scale_factor_x

    if (Scale_factor_y > Scale_factor_x)
    then
        Scale_factor = Scale_factor_x
    else
        Scale_factor = Scale_factor_y
    end

    if Scale_factor > My_font_size
    then
        Font_size = My_font_size
    else
        Font_size = math.floor(Scale_factor)
    end
    overrides.font_size = Font_size
    window:set_config_overrides(overrides)
end

wezterm.on('window-resized', function(window)
    Recompute_font_size(window)
end)

for i = 1, 8 do
    -- CTRL+ALT + number to activate that tab
    table.insert(mykeys, {
        key = tostring(i),
        mods = 'CTRL|ALT',
        action = act.ActivateTab(i - 1),
    })
    -- F1 through F8 to activate that tab
    table.insert(mykeys, {
        key = 'F' .. tostring(i),
        action = act.ActivateTab(i - 1),
    })
end

if wezterm.target_triple == 'x86_64-pc-windows-msvc' then
    Default_prog = { 'powershell.exe' }
else
    Default_prog = { 'zsh' }
end

if wezterm.target_triple == 'x86_64-pc-windows-msvc' then
    Font = wezterm.font 'VictorMono NF'
else
    Font = wezterm.font 'VictorMono Nerd Font'
end

return {
    font = Font,
    font_size = Font_size,
    color_scheme = 'GruvboxDark',
    -- window_background_opacity = 0.9,
    window_close_confirmation = 'NeverPrompt',
    default_prog = Default_prog,
    enable_wayland = true,
    hide_tab_bar_if_only_one_tab = true,
    default_cursor_style = 'SteadyBlock',

    front_end = "OpenGL",

    keys = {
        -- {{{1
        {
            key = 'F1',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F2',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F3',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F4',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F5',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F6',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F7',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F8',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F9',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F10',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F11',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        {
            key = 'F12',
            mods = 'CMD',
            action = wezterm.action.DisableDefaultAssignment,
        },
        -- }}}
    }
}

Expected Behavior

Smooth experience as advertised.

Logs

Debug Overlay
wezterm version: 20231112-171650-721fbdf5 x86_64-unknown-linux-gnu
Window Environment: Wayland
OpenGL: AMD Radeon RX 6750 XT (navi22, LLVM 16.0.6, DRM 3.54, 6.6.1-arch1-1) 4.6 (Compatibility Profile) Mesa 23.2.1-arch1.2
Enter lua statements or expressions and hit Enter.
Press ESC or CTRL-D to exit
00:21:26.807 DEBUG wezterm_term::screen > scroll_up_within_margins region:0..42 margins:0..88 rows=1
00:21:26.807 DEBUG wezterm_term::screen > scroll_up 0..42 num_rows=1 phys_scroll=3500..3542
00:21:26.807 DEBUG wezterm_term::terminalstate::performer > perform PrintString("37867")
00:21:26.807 DEBUG wezterm_term::terminalstate::performer > perform Control(CarriageReturn)
00:21:26.808 DEBUG wezterm_term::terminalstate::performer > perform Control(LineFeed)
00:21:26.808 DEBUG wezterm_term::screen > scroll_up_within_margins region:0..42 margins:0..88 rows=1
00:21:26.808 DEBUG wezterm_term::screen > scroll_up 0..42 num_rows=1 phys_scroll=3500..3542
00:21:26.808 DEBUG wezterm_term::terminalstate::performer > perform PrintString("37868")
00:21:26.808 DEBUG wezterm_term::terminalstate::performer > perform Control(CarriageReturn)
00:21:26.809 TRACE mux > read_pty pane 0 read 105 bytes
00:21:26.809 DEBUG wezterm_term::terminalstate::performer > perform Control(LineFeed)
00:21:26.809 DEBUG wezterm_term::screen > scroll_up_within_margins region:0..42 margins:0..88 rows=1
00:21:26.809 DEBUG wezterm_term::screen > scroll_up 0..42 num_rows=1 phys_scroll=3500..3542
00:21:26.809 DEBUG wezterm_term::terminalstate::performer > perform PrintString("37869")
00:21:26.809 TRACE mux > read_pty pane 0 read 280 bytes
00:21:26.809 DEBUG wezterm_term::terminalstate::performer > perform Control(CarriageReturn)
00:21:26.809 TRACE mux > read_pty pane 0 read 105 bytes
00:21:26.809 TRACE wezterm_term::terminalstate::performer > print x=0 y=41 print_width=1 width=88 cell=3 CellAttributes { attributes: 0, intensity: Normal, underline: None, blink: None, italic: false, reverse: false, strikethrough: false, invisible: false, wrapped: false, overline: false, semantic_type: Output, foreground: Default, background: Default, fat: None }
00:21:26.809 TRACE mux > read_pty pane 0 read 105 bytes
00:21:26.809 TRACE wezterm_term::terminalstate::performer > print x=1 y=41 print_width=1 width=88 cell=7 CellAttributes { attributes: 0, intensity: Normal, underline: None, blink: None, italic: false, reverse: false, strikethrough: false, invisible: false, wrapped: false, overline: false, semantic_type: Output, foreground: Default, background: Default, fat: None }
00:21:26.809 TRACE mux > read_pty pane 0 read 119 bytes
00:21:26.809 TRACE wezterm_term::terminalstate::performer > print x=2 y=41 print_width=1 width=88 cell=8 CellAttributes { attributes: 0, intensity: Normal, underline: None, blink: None, italic: false, reverse: false, strikethrough: false, invisible: false, wrapped: false, overline: false, semantic_type: Output, foreground: Default, background: Default, fat: None }
00:21:26.809 TRACE mux > read_pty pane 0 read 105 bytes
00:21:26.809 TRACE wezterm_term::terminalstate::performer > print x=3 y=41 print_width=1 width=88 cell=6 CellAttributes { attributes: 0, intensity: Normal, underline: None, blink: None, italic: false, reverse: false, strikethrough: false, invisible: false, wrapped: false, overline: false, semantic_type: Output, foreground: Default, background: Default, fat: None }
00:21:26.809 TRACE mux > read_pty pane 0 read 112 bytes
00:21:26.809 TRACE wezterm_term::terminalstate::performer > print x=4 y=41 print_width=1 width=88 cell=9 CellAttributes { attributes: 0, intensity: Normal, underline: None, blink: None, italic: false, reverse: false, strikethrough: false, invisible: false, wrapped: false, overline: false, semantic_type: Output, foreground: Default, background: Default, fat: None }

Anything else?

No response

[uncomfyhalomacro]

@grappas how did you build wezterm? what flags did you use?

[grappas]

It's compiled via AUR package.

[grappas]

@grappas how did you build wezterm? what flags did you use?

I just compiled and ran wezterm without any flags. Very same behaviour.

[uncomfyhalomacro]

odd. i just used seq 1 10000 to both. not too sure what im seeing. im also using latest git master or at least a very recent commit (if it changed now) from a few days ago. i cant replicate your bug report

[grappas]

What's your setup?

[uncomfyhalomacro]

i use opensuse tumbleweed. i maintain the unofficial wezterm package in opensuse - https://build.opensuse.org/package/show/X11:terminals/wezterm

so im still not sure how to replicate yours. mine is very close to latest commits hence the +git<number of commits> there

[grappas]

What I meant: what dm/compositor are you using?

[uncomfyhalomacro]

riverwm

[grappas]

Ah... shit. My bad.

WEZTERM_LOG=debug is set globally in my env. That was the cause. I'm very sorry for being an idiot. 🤦🤦🤦🤦🤦🤦

[github-actions[bot]]

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