drupal stuck at admin and getting slow - how to troubleshoot a modules?

how do i detect what mod开发者_如何学编程ule causes the whole site to be slow? i recentcly added some new modules and one of them i think causes me problems

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The Drupal handbooks have a page on server tuning considerations.

Some methods include installing the Devel module to track down slow queries or profile memory usage. Or you can selectively disable modules, to track down the offender.