diff --git a/CHANGELOG.md b/CHANGELOG.md
index f51b919..f98f75d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,26 @@ All notable changes to the Leo Claude Marketplace will be documented in this fil
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
+### Changed
+
+#### Sprint 8: Hook Efficiency Quick Wins
+Performance optimizations for plugin hooks to reduce overhead on every command.
+
+**Changes:**
+- **viz-platform:** Remove SessionStart hook that only echoed "loaded" (zero value)
+- **git-flow:** Add early exit to `branch-check.sh` for non-git commands (skip JSON parsing)
+- **git-flow:** Add early exit to `commit-msg-check.sh` for non-git commands (skip Python spawn)
+- **project-hygiene:** Add 60-second cooldown to `cleanup.sh` (reduce find operations)
+
+**Impact:** Hooks now exit immediately for 90%+ of Bash commands that don't need processing.
+
+**Issues:** #321, #322, #323, #324
+**PR:** #334
+
+---
+
 ## [5.4.1] - 2026-01-30
 
 ### Removed
diff --git a/plugins/git-flow/hooks/branch-check.sh b/plugins/git-flow/hooks/branch-check.sh
index 72527db..ded10ba 100755
--- a/plugins/git-flow/hooks/branch-check.sh
+++ b/plugins/git-flow/hooks/branch-check.sh
@@ -6,6 +6,11 @@
 # Read tool input from stdin (JSON format)
 INPUT=$(cat)
 
+# Quick check - exit immediately if not a git command
+if ! echo "$INPUT" | grep -q '"command".*git'; then
+    exit 0
+fi
+
 # Extract command from JSON input
 # The Bash tool sends {"command": "..."} format
 COMMAND=$(echo "$INPUT" | grep -o '"command"[[:space:]]*:[[:space:]]*"[^"]*"' | head -1 | sed 's/.*"command"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/')
diff --git a/plugins/git-flow/hooks/commit-msg-check.sh b/plugins/git-flow/hooks/commit-msg-check.sh
index 89eef46..78ee4ee 100755
--- a/plugins/git-flow/hooks/commit-msg-check.sh
+++ b/plugins/git-flow/hooks/commit-msg-check.sh
@@ -6,6 +6,12 @@
 # Read tool input from stdin
 INPUT=$(cat)
 
+# Quick check - exit immediately if not a git commit command
+# This avoids spawning Python for 99% of Bash commands
+if ! echo "$INPUT" | grep -q '"command".*git.*commit'; then
+    exit 0
+fi
+
 # Use Python to properly parse JSON and extract the command
 COMMAND=$(echo "$INPUT" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('command',''))" 2>/dev/null)
 
diff --git a/plugins/project-hygiene/hooks/cleanup.sh b/plugins/project-hygiene/hooks/cleanup.sh
index 2aa5763..c75abac 100755
--- a/plugins/project-hygiene/hooks/cleanup.sh
+++ b/plugins/project-hygiene/hooks/cleanup.sh
@@ -10,6 +10,17 @@ PREFIX="[project-hygiene]"
 # Read tool input from stdin (discard - we don't need it for cleanup)
 cat > /dev/null
 
+# Cooldown - skip if ran in last 60 seconds
+# Using $PPID ties cooldown to the Claude session
+LAST_RUN_FILE="/tmp/project-hygiene-${PPID}-last-run"
+if [[ -f "$LAST_RUN_FILE" ]]; then
+    LAST_RUN=$(cat "$LAST_RUN_FILE")
+    NOW=$(date +%s)
+    if (( NOW - LAST_RUN < 60 )); then
+        exit 0
+    fi
+fi
+
 PROJECT_ROOT="${PROJECT_ROOT:-.}"
 DELETED_COUNT=0
 
@@ -25,4 +36,7 @@ if [[ $DELETED_COUNT -gt 0 ]]; then
     echo "$PREFIX Cleaned $DELETED_COUNT temp files"
 fi
 
+# Record this run for cooldown
+date +%s > "$LAST_RUN_FILE"
+
 exit 0
diff --git a/plugins/viz-platform/hooks/hooks.json b/plugins/viz-platform/hooks/hooks.json
index 6e590e3..b9820d5 100644
--- a/plugins/viz-platform/hooks/hooks.json
+++ b/plugins/viz-platform/hooks/hooks.json
@@ -1,10 +1,3 @@
 {
-  "hooks": [
-    {
-      "event": "SessionStart",
-      "type": "command",
-      "command": "echo 'viz-platform plugin loaded'",
-      "timeout": 5000
-    }
-  ]
+  "hooks": []
 }