diff --git a/scripts/orchestra_e2e_healthcheck.sh b/scripts/orchestra_e2e_healthcheck.sh
index f6fa7ee..a9151b6 100755
--- a/scripts/orchestra_e2e_healthcheck.sh
+++ b/scripts/orchestra_e2e_healthcheck.sh
@@ -12,6 +12,8 @@ shebang_is_bash usage_text_mentions_every_flag"
 
 # name=ok / name=fail pairs, in run order.
 RESULTS=
+# name=ms pairs, in run order.
+TIMES=
 FAILED=0
 TOTAL=0
 
@@ -82,7 +84,7 @@ usage() {
   emit "$1" '  --quiet  Suppress the success message; still exits 0.\n'
   emit "$1" '  --json   Print a single-line JSON result; still exits 0.\n'
   emit "$1" '  --help   Print this usage text and exit 0.\n'
-  emit "$1" '  --summary  Print one line per check before the success message.\n'
+  emit "$1" '  --summary  Print one line per check before the success message, then the slowest check after it.\n'
   emit "$1" '  --timing Print elapsed milliseconds for the run.\n'
   emit "$1" '  --strict Reject an unrecognised flag: exits 2.\n'
   emit "$1" '  --list-checks  Print the name of each check; exits 0.\n'
@@ -133,13 +135,15 @@ main() {
     exit 2
   fi
 
-  local name
+  local name check_start
   for name in $CHECKS; do
+    check_start=$(now_us)
     if "check_$name"; then
       record "$name" ok
     else
       record "$name" fail
     fi
+    TIMES="$TIMES $name=$(elapsed_ms "$check_start")"
   done
 
   local format=text
@@ -176,6 +180,19 @@ main() {
   fi
 
   emit "$format" '%s\n' "$SUCCESS_MESSAGE"
+
+  if [ -n "$summary" ]; then
+    local slow_name= slow_ms=-1 ms
+    for entry in $TIMES; do
+      ms=${entry#*=}
+      if [ "$ms" -gt "$slow_ms" ]; then
+        slow_ms=$ms
+        slow_name=${entry%=*}
+      fi
+    done
+    emit "$format" 'slowest: %s (%sms)\n' "$slow_name" "$slow_ms"
+  fi
+
   exit 0
 }
 
diff --git a/scripts/test_healthcheck.sh b/scripts/test_healthcheck.sh
index 3b7cfea..f210f92 100755
--- a/scripts/test_healthcheck.sh
+++ b/scripts/test_healthcheck.sh
@@ -7,7 +7,7 @@ NAMES='repo_root_readable scripts_dir_present healthcheck_executable_bit
 selftest_present test_healthcheck_present readme_present
 no_crlf_line_endings no_tabs_in_scripts
 shebang_is_bash usage_text_mentions_every_flag'
-USAGE="$(printf 'Usage: orchestra_e2e_healthcheck.sh [--quiet] [--json] [--summary] [--timing] [--strict] [--list-checks]\n\nHealthcheck script for Orchestra E2E tests.\nExits 0 with a success message if all checks pass.\n  --quiet  Suppress the success message; still exits 0.\n  --json   Print a single-line JSON result; still exits 0.\n  --help   Print this usage text and exit 0.\n  --summary  Print one line per check before the success message.\n  --timing Print elapsed milliseconds for the run.\n  --strict Reject an unrecognised flag: exits 2.\n  --list-checks  Print the name of each check; exits 0.\n\nChecks:\n  repo_root_readable\n  scripts_dir_present\n  healthcheck_executable_bit\n  selftest_present\n  test_healthcheck_present\n  readme_present\n  no_crlf_line_endings\n  no_tabs_in_scripts\n  shebang_is_bash\n  usage_text_mentions_every_flag\n\nVersion: 1.0.0')"
+USAGE="$(printf 'Usage: orchestra_e2e_healthcheck.sh [--quiet] [--json] [--summary] [--timing] [--strict] [--list-checks]\n\nHealthcheck script for Orchestra E2E tests.\nExits 0 with a success message if all checks pass.\n  --quiet  Suppress the success message; still exits 0.\n  --json   Print a single-line JSON result; still exits 0.\n  --help   Print this usage text and exit 0.\n  --summary  Print one line per check before the success message, then the slowest check after it.\n  --timing Print elapsed milliseconds for the run.\n  --strict Reject an unrecognised flag: exits 2.\n  --list-checks  Print the name of each check; exits 0.\n\nChecks:\n  repo_root_readable\n  scripts_dir_present\n  healthcheck_executable_bit\n  selftest_present\n  test_healthcheck_present\n  readme_present\n  no_crlf_line_endings\n  no_tabs_in_scripts\n  shebang_is_bash\n  usage_text_mentions_every_flag\n\nVersion: 1.0.0')"
 fails=0
 
 check() { # check <expected-stdout> <label> [args...]
@@ -71,10 +71,18 @@ for name in $NAMES; do
     *) printf 'FAIL: --summary omits %s\n' "$name"; fails=$((fails + 1)) ;;
   esac
 done
-case "$summary_out" in
+# The success line, then the slowest footer as the final line.
+summary_tail=${summary_out##*$'\n'}
+summary_body=${summary_out%$'\n'*}
+case "$summary_body" in
   *"$OK") ;;
   *) printf 'FAIL: --summary does not end with the success line\n'; fails=$((fails + 1)) ;;
 esac
+case "$summary_tail" in
+  'slowest: '*'ms)') ;;
+  *) printf 'FAIL: --summary does not end with the slowest line\n---got---\n%s\n' "$summary_tail"; fails=$((fails + 1)) ;;
+esac
+check '' '--quiet --summary' --quiet --summary
 
 # --timing prints an elapsed line, and composes with --json and --quiet.
 contains 'healthchecks:' '--timing' --timing