lua-nvim/NVIM_PERFORMANCE_ANALYSIS.md

# Neovim Performance Analysis & Optimization Results

## Overview
This document analyzes the performance profile from `nvim-profile.log` and shows the results of applied optimizations.

## 📊 Performance Comparison Results

### ✅ **Significant Improvements**

#### 1. Clipboard Provider Performance
- **Before**: 2.16s total time, 123 calls
- **After**: 0.54s total time, 78 calls
- **Improvement**: **75% reduction** in total time, **37% fewer** calls
- **Status**: ✅ **MAJOR SUCCESS**

#### 2. Syntax Loading Performance  
- **Before**: 0.70s total time, 699 calls
- **After**: 0.47s total time, 189 calls
- **Improvement**: **33% reduction** in total time, **73% fewer** calls
- **Status**: ✅ **SUCCESS**

#### 3. Filetype Plugin Loading
- **Before**: 0.70s total time, 278 calls
- **After**: 0.62s total time, 175 calls
- **Improvement**: **11% reduction** in total time, **37% fewer** calls
- **Status**: ✅ **MODERATE SUCCESS**

### ⚠️ **Performance Regressions**

#### 4. WakaTime Plugin Performance
- **Before**: 0.48s total time, 686 calls
- **After**: 1.82s total time, 2,052 calls
- **Change**: **279% increase** in total time, **199% more** calls
- **Status**: ❌ **REGRESSION** - Need to investigate

#### 5. Matchparen Highlighting
- **Before**: 0.23s total time, 2,912 calls
- **After**: 0.78s total time, 6,055 calls
- **Change**: **239% increase** in total time, **108% more** calls
- **Status**: ❌ **REGRESSION** - Need to investigate

## 🔧 Applied Optimizations

### ✅ Successful Optimizations

#### 1. Keymap Conflict Resolution
- **Fixed**: Changed `<leader>s` to `<leader>sub` to avoid conflict with `<leader>fs`
- **File**: `lua/cargdev/core/keymaps/plugins.lua`
- **Impact**: `<leader>fs` now works correctly for file search
- **Status**: ✅ **CONFIRMED WORKING**

#### 2. Clipboard Provider Optimization
- **Fixed**: Added explicit macOS clipboard configuration
- **File**: `lua/cargdev/core/options.lua`
- **Changes**: Configured `pbcopy`/`pbpaste` with caching enabled
- **Result**: **75% performance improvement**
- **Status**: ✅ **MAJOR SUCCESS**

#### 3. Syntax Loading Optimization
- **Fixed**: Optimized syntax highlighting settings
- **File**: `lua/cargdev/core/options.lua`
- **Changes**: Reduced `synmaxcol` to 200, disabled modelines
- **Result**: **33% performance improvement**
- **Status**: ✅ **SUCCESS**

#### 4. Filetype Plugin Optimization
- **Fixed**: Optimized filetype plugin loading
- **File**: `lua/cargdev/core/options.lua`
- **Changes**: Disabled modelines for security and performance
- **Result**: **11% performance improvement**
- **Status**: ✅ **MODERATE SUCCESS**

### ❌ Failed Optimizations

#### 5. WakaTime Performance Optimization
- **Attempted**: Optimized heartbeat frequency and buffering
- **File**: `lua/cargdev/plugins/wakatime.lua`
- **Changes**: Increased heartbeat frequency to 2 minutes, enabled buffering
- **Result**: **279% performance regression**
- **Status**: ❌ **NEEDS REVERT**

#### 6. Matchparen Performance Optimization
- **Attempted**: Reduced timeout values for faster response
- **File**: `lua/cargdev/core/options.lua`
- **Changes**: Reduced `matchparen_timeout` to 100ms, `matchparen_insert_timeout` to 50ms
- **Result**: **239% performance regression**
- **Status**: ❌ **NEEDS REVERT**

## 🚨 Issues Requiring Immediate Attention

### 1. WakaTime Regression
**Problem**: WakaTime is now consuming significantly more resources
**Possible Causes**:
- Buffering enabled may be causing overhead
- Increased heartbeat frequency may be triggering more processing
- Debug mode changes may have unintended effects

**Recommended Actions**:
- Revert WakaTime configuration to original settings
- Consider disabling WakaTime temporarily to measure impact
- Investigate alternative WakaTime configurations

### 2. Matchparen Regression
**Problem**: Matchparen highlighting is now much slower
**Possible Causes**:
- Reduced timeout values may be causing more frequent recalculations
- Timeout settings may be conflicting with other optimizations
- The optimization may have triggered a different code path

**Recommended Actions**:
- Revert matchparen timeout settings to defaults
- Test with original settings to confirm improvement
- Consider alternative matchparen optimization strategies

## 📈 Overall Performance Impact

### Net Performance Change
- **Clipboard**: +1.62s improvement
- **Syntax**: +0.23s improvement  
- **Filetype**: +0.08s improvement
- **WakaTime**: -1.34s regression
- **Matchparen**: -0.55s regression

**Net Result**: **+0.04s improvement** (essentially neutral)

### Recommendations
1. **Keep successful optimizations** (clipboard, syntax, filetype)
2. **Revert failed optimizations** (WakaTime, matchparen)
3. **Investigate alternative approaches** for WakaTime and matchparen
4. **Consider disabling WakaTime** if not actively used

## 🔍 **Additional Performance Issues Discovered**

### 6. CursorHold Events Performance
- **Total Time**: 0.92s (CursorHold_Cb) + 0.30s (CursorHoldI_Cb) = **1.22s total**
- **Calls**: 1,213 + 625 = **1,838 calls**
- **Issue**: FixCursorHold plugin is consuming significant resources
- **Status**: ⚠️ **NEW ISSUE** - Major performance bottleneck

### 7. Tmux Navigation Performance  
- **Total Time**: 0.61s (TmuxAwareNavigate) + 0.56s (VimNavigate) = **1.17s total**
- **Calls**: 63 + 63 = **126 calls**
- **Issue**: Tmux-aware navigation is slow
- **Status**: ⚠️ **NEW ISSUE** - Significant overhead

### 8. Treesitter Indentation Performance
- **Total Time**: 0.08s
- **Calls**: 15 calls
- **Issue**: Treesitter indentation is being called frequently
- **Status**: ⚠️ **NEW ISSUE** - Moderate impact

### 9. WakaTime Heartbeat System
- **Total Time**: 0.98s (SetLastHeartbeat) + 0.11s (SendHeartbeats) = **1.09s total**
- **Calls**: 206 + 60 = **266 calls**
- **Issue**: Heartbeat system is very slow
- **Status**: ❌ **MAJOR ISSUE** - Part of WakaTime regression

## 📊 **Updated Performance Summary**

### Total Performance Impact (All Issues)
- **WakaTime System**: 2.91s total (HandleActivity + Heartbeats)
- **CursorHold Events**: 1.22s total
- **Tmux Navigation**: 1.17s total  
- **Matchparen**: 0.78s total
- **Clipboard**: 0.54s total (improved from 2.16s)
- **Syntax Loading**: 0.47s total (improved from 0.70s)
- **Filetype Plugins**: 0.62s total (improved from 0.70s)

**Total Identified Issues**: **~7.7 seconds** of performance overhead

## 🚨 **Critical Issues Requiring Immediate Attention**

### 1. WakaTime Complete System Failure
- **Problem**: Entire WakaTime system is consuming 2.91s total
- **Components**: HandleActivity (1.82s) + Heartbeats (1.09s)
- **Impact**: Single biggest performance bottleneck
- **Action**: **DISABLE WAKATIME IMMEDIATELY**

### 2. CursorHold Events Overhead
- **Problem**: FixCursorHold plugin consuming 1.22s
- **Impact**: Major performance hit on cursor movement
- **Action**: **OPTIMIZE OR DISABLE FixCursorHold**

### 3. Tmux Navigation Overhead
- **Problem**: Tmux-aware navigation consuming 1.17s
- **Impact**: Significant overhead for navigation
- **Action**: **OPTIMIZE Tmux integration**

## 🎯 **Revised Priority Actions**

### Immediate (Critical)
1. **Disable WakaTime completely** - Save 2.91s
2. **Optimize FixCursorHold** - Save up to 1.22s
3. **Revert matchparen settings** - Save 0.55s

### High Priority
4. **Optimize Tmux navigation** - Save up to 1.17s
5. **Investigate Treesitter indentation** - Save up to 0.08s

### Medium Priority
6. **Keep successful optimizations** (clipboard, syntax, filetype)

**Potential Total Savings**: **~5.8 seconds** (75% improvement)

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*Analysis based on comparison of original and optimized nvim-profile.log*
*Last updated: $(date)*
*Keymap conflict: ✅ Fixed | Clipboard: ✅ 75% improvement | Syntax: ✅ 33% improvement | Filetype: ✅ 11% improvement | WakaTime: ❌ 279% regression | Matchparen: ❌ 239% regression*