diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index a684368..b26375a 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -49,6 +49,9 @@
       "version": "0.1.0"
     },
     {
+      "name": "perf",
+      "source": "./claude/perf",
+      "description": "Performance profiling helpers for Go and PHP.",
       "name": "core",
       "source": "./claude/core",
       "description": "Core functionality - release management",
diff --git a/claude/perf/.claude-plugin/plugin.json b/claude/perf/.claude-plugin/plugin.json
new file mode 100644
index 0000000..d48f4b7
--- /dev/null
+++ b/claude/perf/.claude-plugin/plugin.json
@@ -0,0 +1,7 @@
+{
+  "name": "perf",
+  "description": "Performance profiling helpers for Go and PHP.",
+  "version": "0.1.0",
+  "author": "Jules",
+  "license": "EUPL-1.2"
+}
diff --git a/claude/perf/commands/perf.md b/claude/perf/commands/perf.md
new file mode 100644
index 0000000..9f65087
--- /dev/null
+++ b/claude/perf/commands/perf.md
@@ -0,0 +1,59 @@
+---
+name: perf
+description: Performance profiling helpers for Go and PHP.
+args: <subcommand> [options]
+---
+
+# Performance Profiling
+
+Profile test suite, HTTP requests, and analyze slow queries and memory usage.
+
+## Subcommands
+
+- `test`: Profile the test suite.
+- `request <url>`: Profile an HTTP request.
+- `query <query>`: Analyze a slow query (requires MySQL client and credentials).
+- `memory [script_path]`: Analyze memory usage.
+
+## Usage
+
+```
+/core:perf test
+/core:perf request /api/users
+/core:perf query "SELECT * FROM users WHERE email = 'test@example.com'"
+/core:perf memory
+```
+
+## Actions
+
+### Test Profiling
+
+Run this command to profile the test suite:
+
+```bash
+"${CLAUDE_PLUGIN_ROOT}/scripts/perf-test.sh"
+```
+
+### Request Profiling
+
+Run this command to profile an HTTP request:
+
+```bash
+"${CLAUDE_PLUGIN_ROOT}/scripts/perf-request.sh" "<url>"
+```
+
+### Query Analysis
+
+Run this command to analyze a slow query:
+
+```bash
+"${CLAUDE_PLUGIN_ROOT}/scripts/perf-query.sh" "<query>"
+```
+
+### Memory Analysis
+
+Run this command to analyze memory usage:
+
+```bash
+"${CLAUDE_PLUGIN_ROOT}/scripts/perf-memory.sh" "<script_path>"
+```
diff --git a/claude/perf/scripts/perf-memory.sh b/claude/perf/scripts/perf-memory.sh
new file mode 100644
index 0000000..01dd7c0
--- /dev/null
+++ b/claude/perf/scripts/perf-memory.sh
@@ -0,0 +1,82 @@
+#!/bin/bash
+
+set -e
+
+if [ -f "go.mod" ]; then
+  PROJECT_TYPE="go"
+elif [ -f "composer.json" ]; then
+  PROJECT_TYPE="php"
+else
+  echo "Error: Unable to determine project type. No go.mod or composer.json found."
+  exit 1
+fi
+
+echo "Detected project type: $PROJECT_TYPE"
+
+case $PROJECT_TYPE in
+  "go")
+    if [ ! -f "mem.prof" ]; then
+      echo "Error: Memory profile 'mem.prof' not found."
+      echo "Please run '/core:perf test' on your Go project first to generate the memory profile."
+      exit 1
+    fi
+    echo "Analyzing Go memory profile..."
+    go tool pprof -top mem.prof
+    ;;
+  "php")
+    if ! php -m | grep -q 'Xdebug'; then
+      echo "Xdebug is not installed. Please install it to use the PHP memory profiler."
+      exit 1
+    fi
+
+    if [ -z "$1" ]; then
+      echo "Usage for PHP: $0 <path_to_php_script>"
+      exit 1
+    fi
+
+    PHP_SCRIPT=$1
+    if [ ! -f "$PHP_SCRIPT" ]; then
+      echo "Error: File not found: $PHP_SCRIPT"
+      exit 1
+    fi
+
+    echo "Generating memory profile for $PHP_SCRIPT..."
+    # Generate a unique filename for the profile output
+    PROFILE_OUTPUT="cachegrind.out.$$"
+    XDEBUG_MODE=profile php -d xdebug.profiler_output_name="$PROFILE_OUTPUT" "$PHP_SCRIPT" > /dev/null 2>&1
+
+    if [ ! -f "$PROFILE_OUTPUT" ]; then
+        echo "Error: Memory profile could not be generated. Check your Xdebug configuration."
+        exit 1
+    fi
+
+    echo "Analyzing memory profile..."
+    # Parse the cachegrind file to find functions with high memory usage
+    awk '
+        /^fn=/ {
+            current_function = substr($0, 4)
+        }
+        /^[0-9]/ {
+            # Column 2 is self-inclusive memory cost
+            memory_cost = $2
+            functions[current_function] += memory_cost
+        }
+        END {
+            for (func in functions) {
+                printf "%12d %s\n", functions[func], func
+            }
+        }
+    ' "$PROFILE_OUTPUT" | sort -nr | head -n 10 > top_memory_functions.log
+
+    echo "--- Top 10 Memory-Consuming Functions (in bytes) ---"
+    cat top_memory_functions.log
+    echo "----------------------------------------------------"
+
+    echo "Actionable Suggestions:"
+    echo "  - Review the functions listed above. High memory usage may indicate large arrays, unreleased resources, or inefficient data structures."
+    echo "  - For processing large files or database results, consider using generators to reduce memory footprint."
+
+    # Clean up the generated files
+    rm "$PROFILE_OUTPUT" top_memory_functions.log
+    ;;
+esac
diff --git a/claude/perf/scripts/perf-query.sh b/claude/perf/scripts/perf-query.sh
new file mode 100644
index 0000000..25a7566
--- /dev/null
+++ b/claude/perf/scripts/perf-query.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+
+set -e
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 \"<query>\""
+  echo "Required environment variables: DB_HOST, DB_USER, DB_PASS, DB_NAME"
+  exit 1
+fi
+
+if ! command -v mysql &> /dev/null; then
+    echo "mysql command could not be found. Please install the MySQL client."
+    exit 1
+fi
+
+if [ -z "$DB_HOST" ] || [ -z "$DB_USER" ] || [ -z "$DB_PASS" ] || [ -z "$DB_NAME" ]; then
+  echo "Error: Missing required database environment variables."
+  echo "Please set DB_HOST, DB_USER, DB_PASS, and DB_NAME."
+  exit 1
+fi
+
+QUERY=$1
+
+echo "Analyzing query: $QUERY"
+
+EXPLAIN_OUTPUT=$(mysql -h"$DB_HOST" -u"$DB_USER" -p"$DB_PASS" "$DB_NAME" -e "EXPLAIN $QUERY" --batch 2>/dev/null)
+
+if [ $? -ne 0 ]; then
+  echo "Error executing EXPLAIN on the query. Please check your query and database credentials."
+  exit 1
+fi
+
+echo "--- EXPLAIN Output ---"
+echo "$EXPLAIN_OUTPUT"
+echo "----------------------"
+
+SUGGESTIONS=""
+
+# suggestion 1: Full table scan
+if echo "$EXPLAIN_OUTPUT" | awk 'NR > 1' | awk '{print $5}' | grep -q "ALL"; then
+    TABLE=$(echo "$EXPLAIN_OUTPUT" | awk 'NR > 1 && $5 == "ALL" {print $3}')
+    SUGGESTIONS+="  - Consider adding an index to the join condition or WHERE clause for table '$TABLE' to avoid a full table scan.\n"
+fi
+
+# suggestion 2: Using filesort
+if echo "$EXPLAIN_OUTPUT" | awk 'NR > 1' | awk '{print $10}' | grep -q "filesort"; then
+    SUGGESTIONS+="  - 'Using filesort' indicates an inefficient sort. Consider adding an index on the columns used in the ORDER BY clause.\n"
+fi
+
+# suggestion 3: Using temporary
+if echo "$EXPLAIN_OUTPUT" | awk 'NR > 1' | awk '{print $10}' | grep -q "temporary"; then
+    SUGGESTIONS+="  - 'Using temporary' indicates the creation of a temporary table, which can be slow. This might be improved by adding an index.\n"
+fi
+
+
+if [ -z "$SUGGESTIONS" ]; then
+  echo "No obvious performance issues found."
+else
+  echo "Actionable Suggestions:"
+  echo -e "$SUGGESTIONS"
+fi
diff --git a/claude/perf/scripts/perf-request.sh b/claude/perf/scripts/perf-request.sh
new file mode 100644
index 0000000..01a3775
--- /dev/null
+++ b/claude/perf/scripts/perf-request.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 <url>"
+  exit 1
+fi
+
+URL=$1
+
+echo "Profiling request to: $URL"
+
+OUTPUT=$(curl -w "time_namelookup=%{time_namelookup}\ntime_connect=%{time_connect}\ntime_appconnect=%{time_appconnect}\ntime_pretransfer=%{time_pretransfer}\ntime_redirect=%{time_redirect}\ntime_starttransfer=%{time_starttransfer}\ntime_total=%{time_total}" -o /dev/null -s "$URL")
+
+# Extract values
+get_value() {
+    echo "$OUTPUT" | grep "$1" | cut -d'=' -f2
+}
+
+TIME_NAMELOOKUP=$(get_value time_namelookup)
+TIME_CONNECT=$(get_value time_connect)
+TIME_STARTTRANSFER=$(get_value time_starttransfer)
+
+echo "--- Timing Metrics ---"
+echo "DNS Lookup:      ${TIME_NAMELOOKUP}s"
+echo "Connect:         ${TIME_CONNECT}s"
+echo "Start Transfer:  ${TIME_STARTTRANSFER}s"
+echo "----------------------"
+
+SUGGESTIONS=""
+
+# Suggestion 1: High DNS lookup time
+if (( $(echo "$TIME_NAMELOOKUP > 0.1" | bc -l) )); then
+    SUGGESTIONS+="  - DNS lookup took over 100ms. Consider using a faster DNS provider or checking your network configuration.\n"
+fi
+
+# Suggestion 2: High connect time
+if (( $(echo "$TIME_CONNECT > 0.2" | bc -l) )); then
+    SUGGESTIONS+="  - Connection time is over 200ms. If this is a remote server, consider using a CDN. If it's local, check for network latency or server load.\n"
+fi
+
+# Suggestion 3: High start transfer time (Time To First Byte)
+if (( $(echo "$TIME_STARTTRANSFER > 0.5" | bc -l) )); then
+    SUGGESTIONS+="  - Time To First Byte (TTFB) is over 500ms. This indicates a slow backend. Profile your application code to identify and optimize bottlenecks.\n"
+fi
+
+if [ -z "$SUGGESTIONS" ]; then
+  echo "No obvious performance issues found."
+else
+  echo "Actionable Suggestions:"
+  echo -e "$SUGGESTIONS"
+fi
diff --git a/claude/perf/scripts/perf-test.sh b/claude/perf/scripts/perf-test.sh
new file mode 100644
index 0000000..f8f54c0
--- /dev/null
+++ b/claude/perf/scripts/perf-test.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -e
+
+if [ -f "go.mod" ]; then
+  PROJECT_TYPE="go"
+elif [ -f "composer.json" ]; then
+  PROJECT_TYPE="php"
+else
+  echo "Error: Unable to determine project type. No go.mod or composer.json found."
+  exit 1
+fi
+
+echo "Detected project type: $PROJECT_TYPE"
+
+case $PROJECT_TYPE in
+  "go")
+    echo "Running Go test profiling..."
+    go test -v -cpuprofile=cpu.prof -memprofile=mem.prof -bench=. 2>&1 | tee test_output.log
+
+    echo "Analyzing test performance..."
+    grep "--- PASS" test_output.log | awk '{print $4, $3}' | sort -nr | head -n 10 > slowest_tests.log
+
+    echo "Slowest tests:"
+    cat slowest_tests.log
+
+    echo ""
+    echo "Actionable Suggestions:"
+    awk '$1 > 2.0 {print "  - The test \""$2"\" took " $1 "s to run. Consider using mocks for external dependencies to speed it up."}' slowest_tests.log
+    ;;
+  "php")
+    if ! php -m | grep -q 'Xdebug'; then
+      echo "Xdebug is not installed. Please install it to use the PHP test profiler."
+      exit 1
+    fi
+
+    echo "Running PHP test profiling..."
+    if [ -f "vendor/bin/pest" ]; then
+      vendor/bin/pest --log-junit report.xml
+    elif [ -f "vendor/bin/phpunit" ]; then
+      vendor/bin/phpunit --log-junit report.xml
+    else
+        echo "Error: No pest or phpunit executable found."
+        exit 1
+    fi
+
+    if ! command -v xmlstarlet &> /dev/null; then
+      echo "xmlstarlet could not be found. Please install it to use this feature."
+      echo "On Debian/Ubuntu: sudo apt-get install xmlstarlet"
+      echo "On macOS (Homebrew): brew install xmlstarlet"
+      exit 1
+    fi
+
+    echo "Analyzing test performance..."
+    xmlstarlet sel -t -m "//testcase" -v "@time" -o " " -v "@name" -n report.xml | sort -nr | head -n 10 > slowest_tests.log
+
+    echo "Slowest tests:"
+    cat slowest_tests.log
+
+    echo ""
+    echo "Actionable Suggestions:"
+    awk '$1 > 2.0 {print "  - The test \""$2"\" took " $1 "s to run. Consider using mocks for external dependencies to speed it up."}' slowest_tests.log
+    ;;
+esac