diff --git a/profile.d/fun.sh b/profile.d/fun.sh
index a42b86c..b7f08a0 100644
--- a/profile.d/fun.sh
+++ b/profile.d/fun.sh
@@ -39,12 +39,30 @@
 # ------------------------------------------------------------------------------
 busy()
 {
-    if [[ -n $1 ]]; then
-        local pattern="$@"
-    else
-        local pattern="ca fe"
-    fi
-    cat /dev/urandom | hexdump -C | grep "$pattern"
+    local pattern="ca fe"
+    for arg in "$@"; do
+        case "$arg" in
+            --delay=*)
+                delay_ms="${arg#*=}"
+                if ! [[ $delay_ms =~ ^[0-9]+$ ]]; then
+                    disp E "Invalid delay value, must be an integer (milliseconds)."
+                    return 1
+                fi
+                ;;
+            *)
+                pattern="$arg"
+                ;;
+        esac
+    done
+
+    # Convert milliseconds to seconds for 'sleep'
+    local delay_s=$(awk "BEGIN { printf \"%.3f\", $delay_ms / 1000 }")
+
+    cat /dev/urandom | hexdump -C | grep --line-buffered "$pattern" | \
+        while read -r line; do
+        echo $line
+        [[ $delay_ms -gt 0 ]] && sleep "$delay_s"
+    done
     unset pattern
 }