diff --git a/bin/dev/perl-check.sh b/bin/dev/perl-check.sh
index 377884b..cfc154d 100755
--- a/bin/dev/perl-check.sh
+++ b/bin/dev/perl-check.sh
@@ -5,13 +5,17 @@ basedir=$(readlink -f "$(dirname "$0")"/../..)
 # shellcheck source=lib/shell/functions.inc
 . "$basedir"/lib/shell/functions.inc
 
-cmdline='-Mstrict -Mwarnings'
-(( fails=0 ))
+# shellcheck disable=SC2064
+trap "rm -f $resultfile" EXIT
+resultfile=$(mktemp)
+
+cmdline="-Mstrict -Mwarnings -I$basedir/lib/perl"
 action_doing "Checking perl files syntax"
 for i in $(find "$basedir"/bin -type f ! -name "*.orig") $(find "$basedir"/lib/perl -type f -name "*.pm") $(find "$basedir"/lib/perl -type f -name "*.inc")
 do
     i=$(readlink -f "$i")
     if head -n1 "$i" | grep -Eq '/perl|/env perl' || head -n2 "$i" | grep -Eq '^package ' ; then
+(
         action_detail "${BLUE}$i${NOC}"
         if grep -q -- 'perl -T' "$i"; then
             # shellcheck disable=SC2086
@@ -20,20 +24,33 @@ do
             # shellcheck disable=SC2086
             perl $cmdline -c  "$i" 2>&1 | grep -v OK$
         fi
-        [ "${PIPESTATUS[0]}" -ne 0 ] && (( fails++ ))
-        [ -n "$DEBUG" ] || continue
-        grep -q '^use warnings' "$i" && echo "(spurious use warnings in $i)"
-        grep -q '^use strict'   "$i" && echo "(spurious use strict in $i)"
-        grep -q '^use common::sense;' "$i" || echo "(missing common::sense in $i)"
+        if [ "${PIPESTATUS[0]}" -ne 0 ]; then
+            # shellcheck disable=SC2094
+            flock "$resultfile" echo -n . >> "$resultfile"
+            exit 1
+        fi
+        if [ -n "$DEBUG" ]; then
+            grep -q '^use warnings' "$i" && echo "(spurious use warnings in $i)"
+            grep -q '^use strict'   "$i" && echo "(spurious use strict in $i)"
+            grep -q '^use common::sense;' "$i" || echo "(missing common::sense in $i)"
+        fi
+) &
     fi
 done
-if [ -x "$basedir/bin/dev/perl-use-all.sh" ] ; then
-    "$basedir/bin/dev/perl-use-all.sh" || (( fails++ ))
-fi
+
+# wait for all parallel check processes to be done
+wait
+
+fails=$(wc -c < "$resultfile")
 
 if [ "$fails" -ne 0 ] ; then
     action_error "Got $fails errors"
+    exit "$fails"
 else
-    action_done "success"
+    action_done ""
+fi
+
+if [ -x "$basedir/bin/dev/perl-use-all.sh" ] ; then
+    "$basedir/bin/dev/perl-use-all.sh"
+    exit $?
 fi
-exit "$fails"
diff --git a/bin/dev/perl-use-all.sh b/bin/dev/perl-use-all.sh
index dbb9cf0..b3209c0 100755
--- a/bin/dev/perl-use-all.sh
+++ b/bin/dev/perl-use-all.sh
@@ -5,35 +5,36 @@ basedir=$(readlink -f "$(dirname "$0")"/../..)
 # shellcheck source=lib/shell/functions.inc
 . "$basedir"/lib/shell/functions.inc
 
-action_doing "Checking list of needed Perl modules..."
-
-missing=""
-
 # shellcheck disable=SC2013
-for module in $(grep -RhEw '(use|require) ([a-zA-Z][a-zA-Z0-9_:]+)' "$basedir/lib/perl/" "$basedir/bin/" | \
+modules=$(
+    grep -RhEw '(use|require) ([a-zA-Z][a-zA-Z0-9_:]+)' "$basedir/lib/perl/" "$basedir/bin/" | \
     grep -v -e '"' -e "'" -e '# pragma optional module' -e OVH:: | \
     sed -re 's/#.*//' | \
     grep -Eo '(use|require) ([a-zA-Z][a-zA-Z0-9_:]+)' | \
     awk '{print $2}' | \
     sort -u | \
-    grep -Ev '^[a-z0-9_]+$')
-do
-    if [ "$1" != "corelist" ]; then
+    grep -Ev '^[a-z0-9_]+$'
+)
+
+if [ "$1" = "corelist" ]; then
+    action_doing "Computing list of non-CORE needed Perl modules..."
+    # shellcheck disable=SC2086
+    for module in $(corelist $modules | awk '/was not in CORE/ {print $1}' | sort); do
+        action_detail "$module"
+    done
+else
+    action_doing "Checking whether all required modules are installed..."
+    perlcmdline="perl "
+    for module in $modules; do
         action_detail "$module"
-        if ! perl -M"$module" -e 1; then
-            action_detail "... failed!"
-            missing="$missing $module"
-        fi
+        perlcmdline="$perlcmdline -M$module"
+    done
+    perlcmdline="$perlcmdline -e 1"
+
+    if ! $perlcmdline; then
+        action_error "Some modules are missing!"
+        exit 1
     else
-        if corelist "$module" | grep -q 'not in CORE'; then
-            action_detail "$module"
-        fi
+        action_done ""
     fi
-done
-
-if [ -n "$missing" ]; then
-    action_error "Missing modules:$missing"
-else
-    # shellcheck disable=SC2119
-    action_done
 fi