Care to little open your situation here? You realize that we have too little information here?

Did you install apps from backup or are you running plane vanilla N900 with only official apps installed and your contacts+messages.

If apps installed you can list them with command
maemo-list-user-packages

.edit
Also is it memory leak or cpu hog? How have you pin pointed that it´s memory bug?How have you traced memory issues with hildon?

..edit
Inf first post you are talking about "this hildon bug" To what are you referring to? Care to give us link to bugzilla entry.