Interface freezes

[timsofteng]

Self Checks

• [ x] I'm using the latest lualine.
• [x ] I didn't find the issue in existing issues or PRs.

How to reproduce the problem

open large file with one single string Apply my config See freezes in interface (movement and so on)

Expected behaviour

interface should be responsible

Actual behaviour

interface is not responsible

Minimal config to reproduce the issue

local colors = {
  black        = '#282828',
  white        = '#ebdbb2',
  red          = '#fb4934',
  green        = '#b8bb26',
  blue         = '#83a598',
  yellow       = '#fe8019',
  gray         = '#a89984',
  darkgray     = '#3c3836',
  lightgray    = '#504945',
  inactivegray = '#7c6f64',
}

local gruvbox = {
  normal = {
    a = { bg = colors.lightgray, fg = colors.white},
    x = { bg = colors.lightgray},
    y = { bg = colors.lightgray, fg = colors.white},
    z = { bg = colors.lightgray, fg = colors.white },
  },
  insert = {
    a = { bg = colors.lightgray, fg = colors.white },
    x = { bg = colors.lightgray},
    y = { bg = colors.lightgray, fg = colors.white },
    z = { bg = colors.lightgray, fg = colors.white },
  },
  visual = {
    a = { bg = colors.lightgray, fg = colors.white },
    x = { bg = colors.lightgray},
    y = { bg = colors.lightgray, fg = colors.white},
    z = { bg = colors.lightgray, fg = colors.white },
  },
  replace = {
    a = { bg = colors.lightgray, fg = colors.white },
    x = { bg = colors.lightgray},
    y = { bg = colors.lightgray, fg = colors.white},
    z = { bg = colors.lightgray, fg = colors.white },
  },
  command = {
    -- a = { bg = colors.inactivegray, fg = colors.black },
    -- x = { bg = colors.inactivegray, fg = colors.black },
    -- y = { bg = colors.inactivegray, fg = colors.black },
    -- z = { bg = colors.inactivegray, fg = colors.black },
  },
  inactive = {
    a = { bg = colors.darkgray, fg = colors.gray },
    z = { bg = colors.darkgray, fg = colors.gray },
  },
}

require('lualine').setup ({
  options = {
    icons_enabled = false,
    theme = gruvbox,
    component_separators = ' ',
    section_separators = '',
    disabled_filetypes = {},
    always_divide_middle = true,
    globalstatus = false,
  },
  sections = {
    lualine_a = {'filename'},
    lualine_b = {},
    lualine_c = {},
    lualine_x = {'diff', 'diagnostics'},
    lualine_y = {'progress'},
    lualine_z = {'location'}
  },
  inactive_sections = {
    lualine_a = {'filename'},
    lualine_b = {},
    lualine_c = {},
    lualine_x = {},
    lualine_y = {},
    lualine_z = {'location'}
  },
  tabline = {},
  extensions = {}
})

[yochem]

My guess: the very large file was version controlled, and the diff component loops through the whole diff. I have this issue currently. See #953.