`live_grep` slow, blocks input

[hood]

Description

When searching for files inside of an small-sized (YMMV) codebase, I've found live_grep to slow down and even suddenly stop processing input for a few seconds:

Neovim version

NVIM v0.8.0-dev
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3

Operating system and version

Arch Linux - 5.16.16-arch1-1

checkhealth telescope

telescope: require("telescope.health").check()
========================================================================
## Checking for required plugins
  - OK: plenary installed.
  - OK: nvim-treesitter installed.

## Checking external dependencies
  - OK: rg: found ripgrep 13.0.0
  - OK: fd: found fd 8.3.2

## ===== Installed extensions =====

## Telescope Extension: `fzf`
  - INFO: No healthcheck provided

Steps to reproduce

invoking Telescope live_grep and searching for stuff is enough

Expected behavior

Results updating in real time, whithout hiccups. Input field processing keystrokes without hiccups.

Actual behavior

Results taking time to update, input field not processing keystrokes all of a sudden.

Minimal config

vim.cmd [[set runtimepath=$VIMRUNTIME]]
vim.cmd [[set packpath=/tmp/nvim/site]]
local package_root = '/tmp/nvim/site/pack'
local install_path = package_root .. '/packer/start/packer.nvim'
local function load_plugins()
  require('packer').startup {
    {
      'wbthomason/packer.nvim',
      {
        'nvim-telescope/telescope.nvim',
        requires = {
          'nvim-lua/plenary.nvim',
          { 'nvim-telescope/telescope-fzf-native.nvim', run = 'make' },
        },
      },
      'BurntSushi/ripgrep'
    },
    config = {
      package_root = package_root,
      compile_path = install_path .. '/plugin/packer_compiled.lua',
      display = { non_interactive = true },
    },
  }
end
_G.load_config = function()
  require('telescope').setup()
  require('telescope').load_extension('fzf')
  -- ADD INIT.LUA SETTINGS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
end
if vim.fn.isdirectory(install_path) == 0 then
  print("Installing Telescope and dependencies.")
  vim.fn.system { 'git', 'clone', '--depth=1', 'https://github.com/wbthomason/packer.nvim', install_path }
end
load_plugins()
require('packer').sync()
vim.cmd [[autocmd User PackerComplete ++once echo "Ready!" | lua load_config()]]

  require('telescope').setup {
    extensions = {
      fzf = {
        fuzzy = true,                    -- false will only do exact matching
        override_generic_sorter = true,  -- override the generic sorter
        override_file_sorter = true,     -- override the file sorter
        case_mode = "smart_case",        -- or "ignore_case" or "respect_case"
                                         -- the default case_mode is "smart_case"
      }
    }
  }

  require'telescope'.load_extension('fzf')

[Conni2461]

Does this happen with Telescope live_grep previewer=false ?

Probably dup of https://github.com/nvim-telescope/telescope.nvim/issues/1379