/performance-check

Performance Check

Please analyze this codebase for performance issues and optimization opportunities:

1. File Size Analysis

Check for files that might be too large:

# Find large files
chs large-files 500  # Files over 500 lines

# Check overall codebase size
ch ts size  # For Node projects
find . -name "*.js" -o -name "*.ts" | xargs wc -l | sort -n

2. Common Performance Anti-Patterns

Search for potential bottlenecks:

# Nested loops
chs find-code "for.*for\|while.*while"
chs find-code "\.forEach.*\.forEach\|\.map.*\.map"

# Synchronous operations
chs find-code "readFileSync\|execSync\|statSync"

# Inefficient array operations
chs find-code "\.shift()\|\.unshift()"

# Large data in memory
chs find-code "JSON\.parse.*readFile\|\.split.*readFile"

3. Bundle & Import Analysis

Check for heavy dependencies:

# Find large imports
chs search-imports "moment\|lodash"

# Check for whole package imports
chs find-code "import .* from ['\"]\w+['\"]"  # vs specific imports

# Find dynamic imports
chs find-code "import(\|require("

4. Async/Promise Issues

Look for async problems:

# Missing await
chs find-code "async.*{" | xargs grep -L "await"

# Promise chains that could be async/await
chs find-code "\.then.*\.then\|\.catch.*\.then"

# Potential race conditions
chs find-code "Promise\.all\|Promise\.race"

5. Memory Leak Risks

Identify potential memory issues:

# Event listeners without cleanup
chs find-code "addEventListener" | xargs grep -L "removeEventListener"

# Timers without cleanup
chs find-code "setInterval\|setTimeout" | xargs grep -L "clear"

# Global variables
chs find-code "^(var\|let\|const).*window\.\|global\."

6. Generate Optimization Report

Create a prioritized list of:

• **Critical**: Issues causing immediate performance problems
• **High**: Significant optimization opportunities
• **Medium**: Good practices that would help
• **Low**: Nice-to-have improvements

For each issue, provide:

• The problem and its impact
• Specific code locations
• Recommended solution
• Estimated effort

Focus on changes that will have measurable impact!