出現這樣的訊息

想請問一下..我的網站出現的這樣的訊息...
Queries taking longer than 5 ms and queries executed more than once, are highlighted. Page execution time was 2615.13 ms.
ms # where query
Memory usage:

* Memory used at devel_init(): 42.23 MB
* Memory used at devel_shutdown(): 51.71 MB

請問該如何處理?...
還是我開啟了哪個模組以至於如此?

我是在安裝完E-commerce後才有這問題...
但移除後E-commerce還是有這訊息出現...

請指點我一下
謝謝