github urbanadventurer/WhatWeb v0.6.4
WhatWeb 0.6.4 — April 3, 2026

6 hours ago

Performance overhaul. Output is no longer the bottleneck.

Replaced the global output mutex with per-logger mutexes, added intelligent buffering that scales with thread count, and delivered up to 20x faster verbose output. New --output-sync and --output-buffer-size flags give you manual control. Set WHATWEB_PROFILE=1 to benchmark it yourself.

WhatWeb is fast now. Really fast.

PERFORMANCE IMPROVEMENTS

  • Major output performance overhaul with up to 20x improvement for verbose output
  • Replaced global output mutex with per-logger mutexes for better concurrency
  • Implemented intelligent output buffering with automatic optimization based on thread count
  • Added --output-sync and --output-buffer-size options for performance tuning
  • Added WHATWEB_PROFILE environment variable for performance

Thanks to Claude from Anthropic for the bug fixes

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