diff --git a/lua/doom/modules/core/treesitter/init.lua b/lua/doom/modules/core/treesitter/init.lua
index bbd454d16..595b68688 100644
--- a/lua/doom/modules/core/treesitter/init.lua
+++ b/lua/doom/modules/core/treesitter/init.lua
@@ -68,13 +68,15 @@ treesitter.packages = {
 treesitter.configs = {}
 treesitter.configs["nvim-treesitter"] = function()
   local is_module_enabled = require("doom.utils").is_module_enabled
-  require("nvim-treesitter.configs").setup(
-    vim.tbl_deep_extend("force", doom.core.treesitter.settings.treesitter, {
-      autopairs = {
-        enable = is_module_enabled("features", "autopairs"),
-      },
-    })
-  )
+  local settings = vim.tbl_deep_extend("force", doom.core.treesitter.settings.treesitter, {
+    autopairs = {
+      enable = is_module_enabled("features", "autopairs"),
+    },
+  })
+  if is_module_enabled("features", "largefile") then
+    settings = require("doom.modules.features.largefile").update_treesitter(settings)
+  end
+  require("nvim-treesitter.configs").setup(settings)
 
   --  Check if user is using clang and notify that it has poor compatibility with treesitter
   --  WARN: 19/11/2021 | issues: #222, #246 clang compatibility could improve in future
diff --git a/lua/doom/modules/features/gitsigns/init.lua b/lua/doom/modules/features/gitsigns/init.lua
index be7906bbc..bdb0137e4 100644
--- a/lua/doom/modules/features/gitsigns/init.lua
+++ b/lua/doom/modules/features/gitsigns/init.lua
@@ -81,7 +81,12 @@ gitsigns.packages = {
 
 gitsigns.configs = {}
 gitsigns.configs["gitsigns.nvim"] = function()
-  require("gitsigns").setup(doom.features.gitsigns.settings)
+  local settings = doom.features.gitsigns.settings
+  local is_module_enabled = require("doom.utils").is_module_enabled
+  if is_module_enabled("features", "largefile") then
+    settings.max_file_length = doom.features.largefile.settings.max_line_count
+  end
+  require("gitsigns").setup(settings)
 end
 
 return gitsigns
diff --git a/lua/doom/modules/features/illuminate/init.lua b/lua/doom/modules/features/illuminate/init.lua
index c649e9125..1fcbca04a 100644
--- a/lua/doom/modules/features/illuminate/init.lua
+++ b/lua/doom/modules/features/illuminate/init.lua
@@ -20,9 +20,16 @@ illuminate.packages = {
   },
 }
 
+
 illuminate.configs = {}
 illuminate.configs["vim-illuminate"] = function()
+  local is_module_enabled = require("doom.utils").is_module_enabled
   vim.g.Illuminate_ftblacklist = doom.features.illuminate.settings.blacklist
+  if is_module_enabled("features", "largefile") then
+    require('illuminate').configure({
+      large_file_cutoff = doom.features.largefile.settings.max_line_count
+    })
+  end
 end
 
 return illuminate
diff --git a/lua/doom/modules/features/largefile/init.lua b/lua/doom/modules/features/largefile/init.lua
new file mode 100644
index 000000000..70ab3a539
--- /dev/null
+++ b/lua/doom/modules/features/largefile/init.lua
@@ -0,0 +1,48 @@
+local largefile = {}
+
+largefile.settings = {
+  max_line_count = 10000,
+}
+
+largefile.packages = {
+  ["LargeFile"] = {
+    "vim-scripts/LargeFile",
+    commit = "3941a37b2b0288524300348a39521a46539bf9f6",
+    setup = function()
+      vim.g.LargeFile = 1 -- 1 MiB
+    end,
+  },
+}
+
+largefile.should_disable = function(_lang, bufnr)
+  -- need to check file size too:
+  -- on initial open the buffer would be unloaded and report line count as 0
+  -- and we'd trigger an initial parsing of the large file which could be
+  -- a delay of seconds
+  local fname = vim.api.nvim_buf_get_name(bufnr)
+  if string.len(fname) > 0 then
+    local fsize = vim.fn.getfsize(fname)
+    if fsize > vim.g.LargeFile * 1024 * 1024 then
+      -- flag for debugging
+      vim.b.LargeFile_treesitter_mode_fsize = true
+      return true
+    end
+  end
+  if vim.api.nvim_buf_line_count(bufnr) > doom.features.largefile.settings.max_line_count then
+    -- flag for debugging
+    vim.b.LargeFile_treesitter_mode_linecount = true
+    return true
+  end
+  return false
+end
+
+largefile.update_treesitter = function(settings)
+  for _, feature in pairs(settings) do
+    -- keep enable as is, but add a function that runs on buffer open
+    -- to determine whether to disable the feature for that buffer
+    feature.disable = largefile.should_disable
+  end
+  return settings
+end
+
+return largefile
diff --git a/lua/doom/modules/features/lsp/init.lua b/lua/doom/modules/features/lsp/init.lua
index e2a277716..c16dbabc7 100644
--- a/lua/doom/modules/features/lsp/init.lua
+++ b/lua/doom/modules/features/lsp/init.lua
@@ -211,14 +211,6 @@ lsp.configs["nvim-cmp"] = function()
 
   local replace_termcodes = utils.replace_termcodes
 
-  local source_map = {
-    nvim_lsp = "[LSP]",
-    luasnip = "[Snp]",
-    buffer = "[Buf]",
-    nvim_lua = "[Lua]",
-    path = "[Path]",
-  }
-
   --- Helper function to check what <Tab> behaviour to use
   --- @return boolean
   local function check_backspace()
diff --git a/lua/doom/modules/langs/cc/init.lua b/lua/doom/modules/langs/cc/init.lua
index ea636112f..ef35424ca 100644
--- a/lua/doom/modules/langs/cc/init.lua
+++ b/lua/doom/modules/langs/cc/init.lua
@@ -1,5 +1,3 @@
-local utils = require("doom.utils")
-
 local cc = {}
 
 cc.settings = {
diff --git a/modules.lua b/modules.lua
index 04463a58c..1c2ef8db4 100644
--- a/modules.lua
+++ b/modules.lua
@@ -26,6 +26,7 @@ return {
     "indentlines", -- Show indent lines with special characters
     "range_highlight", -- Highlight selected range from commands
     "todo_comments", -- Highlight TODO: comments
+    "largefile", -- Disable treesitter and various other slow features on large files
     -- "doom_themes",     -- Extra themes for doom
 
     -- UI Components