diff --git a/test/old/testdir/runtest.vim b/test/old/testdir/runtest.vim
index b7c15a8f18..6b5d370100 100644
--- a/test/old/testdir/runtest.vim
+++ b/test/old/testdir/runtest.vim
@@ -164,6 +164,7 @@ endif
 
 
 " Prepare for calling test_garbagecollect_now().
+" Also avois some delays in Insert mode completion.
 let v:testing = 1
 
 let s:has_ffi = luaeval('pcall(require, "ffi")')
diff --git a/test/old/testdir/test_edit.vim b/test/old/testdir/test_edit.vim
index 7e6ce2a014..2327830d0c 100644
--- a/test/old/testdir/test_edit.vim
+++ b/test/old/testdir/test_edit.vim
@@ -716,12 +716,9 @@ func Test_edit_CTRL_K()
   %d
   call setline(1, 'A')
   call cursor(1, 1)
-  let v:testing = 1
   try
     call feedkeys("A\<c-x>\<c-k>\<esc>", 'tnix')
   catch
-    " error sleeps 2 seconds, when v:testing is not set
-    let v:testing = 0
   endtry
 
   call Ntest_override("char_avail", 1)
@@ -970,12 +967,9 @@ func Test_edit_CTRL_T()
   %d
   call setline(1, 'mad')
   call cursor(1, 1)
-  let v:testing = 1
   try
     call feedkeys("A\<c-x>\<c-t>\<esc>", 'tnix')
   catch
-    " error sleeps 2 seconds, when v:testing is not set
-    let v:testing = 0
   endtry
   call assert_equal(['mad'], getline(1, '$'))
   bw!