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This is a big help to identify critical page load factors, and I would also recommend the YSlow add-on URL: https://addons.mozilla.org/en-US/firefox/addon/2214 which provides you with feasible solutions to load-time problems. YSlow has become nearly indispensable for me...

Это отзыв для предыдущей версии этого дополнения (0.3.3.0).