diff --git a/test/benchmark/decor_spec.lua b/test/benchmark/decor_spec.lua
new file mode 100644
index 0000000000..0994023c2d
--- /dev/null
+++ b/test/benchmark/decor_spec.lua
@@ -0,0 +1,102 @@
+local n = require('test.functional.testnvim')()
+local Screen = require('test.functional.ui.screen')
+local exec_lua = n.exec_lua
+
+describe('decor perf', function()
+  before_each(n.clear)
+
+  it('can handle long lines', function()
+    local screen = Screen.new(100, 101)
+    screen:attach()
+
+    local result = exec_lua [==[
+      local ephemeral_pattern = {
+        { 0, 4, 'Comment', 11 },
+        { 0, 3, 'Keyword', 12 },
+        { 1, 2, 'Label', 12 },
+        { 0, 1, 'String', 21 },
+        { 1, 3, 'Function', 21 },
+        { 2, 10, 'Label', 8 },
+      }
+
+      local regular_pattern = {
+        { 4, 5, 'String', 12 },
+        { 1, 4, 'Function', 2 },
+      }
+
+      for _, list in ipairs({ ephemeral_pattern, regular_pattern }) do
+        for _, p in ipairs(list) do
+          p[3] = vim.api.nvim_get_hl_id_by_name(p[3])
+        end
+      end
+
+      local text = ('abcdefghijklmnopqrstuvwxyz0123'):rep(333)
+      local line_len = #text
+      vim.api.nvim_buf_set_lines(0, 0, 0, false, { text })
+
+      local ns = vim.api.nvim_create_namespace('decor_spec.lua')
+      vim.api.nvim_buf_clear_namespace(0, ns, 0, -1)
+      vim.api.nvim_win_set_cursor(0, { 1, 0 })
+
+      local ps, pe
+      local function add_pattern(pattern, ephemeral)
+        ps = vim.uv.hrtime()
+        local i = 0
+        while i < line_len - 10 do
+          for _, p in ipairs(pattern) do
+            vim.api.nvim_buf_set_extmark(0, ns, 0, i + p[1], {
+              end_row = 0,
+              end_col = i + p[2],
+              hl_group = p[3],
+              priority = p[4],
+              ephemeral = ephemeral,
+            })
+          end
+          i = i + 5
+        end
+        pe = vim.uv.hrtime()
+      end
+
+      vim.api.nvim_set_decoration_provider(ns, {
+        on_win = function()
+          return true
+        end,
+        on_line = function()
+            add_pattern(ephemeral_pattern, true)
+        end,
+      })
+
+      add_pattern(regular_pattern, false)
+
+      local total = {}
+      local provider = {}
+      for i = 1, 100 do
+        local tic = vim.uv.hrtime()
+        vim.cmd'redraw!'
+        local toc = vim.uv.hrtime()
+        table.insert(total, toc - tic)
+        table.insert(provider, pe - ps)
+      end
+
+      return { total, provider }
+    ]==]
+
+    local total, provider = unpack(result)
+    table.sort(total)
+    table.sort(provider)
+
+    local ms = 1 / 1000000
+    local function fmt(stats)
+      return string.format(
+        'min, 25%%, median, 75%%, max:\n\t%0.1fms,\t%0.1fms,\t%0.1fms,\t%0.1fms,\t%0.1fms',
+        stats[1] * ms,
+        stats[1 + math.floor(#stats * 0.25)] * ms,
+        stats[1 + math.floor(#stats * 0.5)] * ms,
+        stats[1 + math.floor(#stats * 0.75)] * ms,
+        stats[#stats] * ms
+      )
+    end
+
+    print('\nTotal ' .. fmt(total) .. '\nDecoration provider: ' .. fmt(provider))
+  end)
+end)