diff --git a/.luarc.json b/.luarc.json
index 0c49a3b..b438cce 100644
--- a/.luarc.json
+++ b/.luarc.json
@@ -2,12 +2,6 @@
   "runtime.version": "Lua 5.1",
   "runtime.path": ["lua/?.lua", "lua/?/init.lua"],
   "diagnostics.globals": ["vim", "jit"],
-  "diagnostics.disable": [
-    "undefined-doc-name",
-    "undefined-doc-class",
-    "undefined-field",
-    "need-check-nil"
-  ],
   "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
   "workspace.checkThirdParty": false,
   "completion.callSnippet": "Replace"
diff --git a/lua/blink-cmp-tmux.lua b/lua/blink-cmp-tmux.lua
index 1653c06..5faf8f7 100644
--- a/lua/blink-cmp-tmux.lua
+++ b/lua/blink-cmp-tmux.lua
@@ -3,9 +3,6 @@ local M = {}
 
 ---@type blink.cmp.CompletionItem[]?
 local cache = nil
-local loading = false
----@type {ctx: blink.cmp.Context, callback: fun(response: blink.cmp.CompletionResponse)}[]
-local pending = {}
 
 function M.new()
   return setmetatable({}, { __index = M })
@@ -16,17 +13,18 @@ function M.enabled()
   return vim.bo.filetype == 'tmux'
 end
 
----@param man_stdout string
----@param names_stdout string
 ---@return table<string, string>
-local function parse_descriptions(man_stdout, names_stdout)
+local function parse_descriptions()
+  local result = vim.system({ 'bash', '-c', 'MANWIDTH=80 man -P cat tmux 2>/dev/null' }):wait()
+  local stdout = result.stdout or ''
   local lines = {}
-  for line in (man_stdout .. '\n'):gmatch('(.-)\n') do
+  for line in (stdout .. '\n'):gmatch('(.-)\n') do
     lines[#lines + 1] = line
   end
 
+  local cmd_result = vim.system({ 'tmux', 'list-commands', '-F', '#{command_list_name}' }):wait()
   local cmds = {}
-  for name in names_stdout:gmatch('[^\n]+') do
+  for name in (cmd_result.stdout or ''):gmatch('[^\n]+') do
     cmds[name] = true
   end
 
@@ -47,7 +45,7 @@ local function parse_descriptions(man_stdout, names_stdout)
     local j = def.line + 1
     while j <= block_end do
       local l = lines[j]
-      if l:match('^%s+%(alias:') or vim.trim(l) == '' then
+      if l:match('^%s+%(alias:') then
         j = j + 1
       elseif l:match('^               ') then
         local stripped = vim.trim(l)
@@ -56,6 +54,8 @@ local function parse_descriptions(man_stdout, names_stdout)
         else
           break
         end
+      elseif vim.trim(l) == '' then
+        j = j + 1
       else
         break
       end
@@ -84,7 +84,7 @@ local function parse_descriptions(man_stdout, names_stdout)
       end
     end
     local desc = table.concat(parts, '\n\n')
-    desc = desc:gsub(string.char(0xe2, 0x80, 0x90) .. ' ', '')
+    desc = desc:gsub('\xe2\x80\x90 ', '')
     desc = desc:gsub('  +', ' ')
     if desc ~= '' then
       descs[def.cmd] = desc
@@ -128,66 +128,27 @@ end
 
 ---@param ctx blink.cmp.Context
 ---@param callback fun(response: blink.cmp.CompletionResponse)
-local function respond(ctx, callback)
+---@return fun()
+function M:get_completions(ctx, callback)
+  if not cache then
+    local ok, descs = pcall(parse_descriptions)
+    if not ok then
+      descs = {}
+    end
+    local result = vim.system({ 'tmux', 'list-commands' }):wait()
+    cache = parse(result.stdout or '', descs)
+  end
+
   local before = ctx.line:sub(1, ctx.cursor[2])
   if before:match('^%s*[a-z-]*$') then
     callback({
       is_incomplete_forward = false,
       is_incomplete_backward = false,
-      items = cache,
+      items = vim.deepcopy(cache),
     })
   else
     callback({ items = {} })
   end
-end
-
----@param ctx blink.cmp.Context
----@param callback fun(response: blink.cmp.CompletionResponse)
----@return fun()
-function M:get_completions(ctx, callback)
-  if cache then
-    respond(ctx, callback)
-    return function() end
-  end
-
-  pending[#pending + 1] = { ctx = ctx, callback = callback }
-  if not loading then
-    loading = true
-    local man_out, names_out, cmds_out
-    local remaining = 3
-
-    local function on_all_done()
-      remaining = remaining - 1
-      if remaining > 0 then
-        return
-      end
-      vim.schedule(function()
-        local ok, descs = pcall(parse_descriptions, man_out, names_out)
-        if not ok then
-          descs = {}
-        end
-        cache = parse(cmds_out, descs)
-        loading = false
-        for _, p in ipairs(pending) do
-          respond(p.ctx, p.callback)
-        end
-        pending = {}
-      end)
-    end
-
-    vim.system({ 'bash', '-c', 'MANWIDTH=80 man -P cat tmux 2>/dev/null' }, {}, function(result)
-      man_out = result.stdout or ''
-      on_all_done()
-    end)
-    vim.system({ 'tmux', 'list-commands', '-F', '#{command_list_name}' }, {}, function(result)
-      names_out = result.stdout or ''
-      on_all_done()
-    end)
-    vim.system({ 'tmux', 'list-commands' }, {}, function(result)
-      cmds_out = result.stdout or ''
-      on_all_done()
-    end)
-  end
   return function() end
 end
 
diff --git a/spec/tmux_spec.lua b/spec/tmux_spec.lua
index da0c32e..3f47a97 100644
--- a/spec/tmux_spec.lua
+++ b/spec/tmux_spec.lua
@@ -26,38 +26,37 @@ local MAN_PAGE = table.concat({
 }, '\n')
 
 local function mock_system()
-  local original_system = vim.system
-  local original_schedule = vim.schedule
+  local original = vim.system
   ---@diagnostic disable-next-line: duplicate-set-field
-  vim.system = function(cmd, _, on_exit)
-    local result
+  vim.system = function(cmd)
     if cmd[1] == 'bash' then
-      result = { stdout = MAN_PAGE, code = 0 }
+      return {
+        wait = function()
+          return { stdout = MAN_PAGE, code = 0 }
+        end,
+      }
     elseif cmd[1] == 'tmux' and cmd[2] == 'list-commands' then
       if cmd[3] == '-F' then
-        result = { stdout = TMUX_NAMES, code = 0 }
-      else
-        result = { stdout = TMUX_COMMANDS, code = 0 }
+        return {
+          wait = function()
+            return { stdout = TMUX_NAMES, code = 0 }
+          end,
+        }
       end
-    else
-      result = { stdout = '', code = 1 }
-    end
-    if on_exit then
-      on_exit(result)
-      return {}
+      return {
+        wait = function()
+          return { stdout = TMUX_COMMANDS, code = 0 }
+        end,
+      }
     end
     return {
       wait = function()
-        return result
+        return { stdout = '', code = 1 }
       end,
     }
   end
-  vim.schedule = function(fn)
-    fn()
-  end
   return function()
-    vim.system = original_system
-    vim.schedule = original_schedule
+    vim.system = original
   end
 end