Relevant Replacements

my web site is
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with page arank 1

is this correct :

Relevant Replacements:<!--VBSEO_RR_1--> will be replaced by:- on forumdisplay pages

PHP Code:

<h1 class="relevant_replacement">[forum_title]</h1><p class="relevant_replacement">Below you will find a list of discussions in the <b>[forum_title]</b> forums at the [bb_title]. The [forum_title] forum [forum_description]</p> 


(and) - on showthread pages.

PHP Code:

<h1 class="relevant_replacement">[thread_title]</h1><p class="relevant_replacement">This is a discussion on <em>[thread_title]</em> within the <b>[forum_title]</b> forums, part of the [parent_forum_title] category; [first_post_20_words]...</p> 


is this OK
is there any other setting related to this ?

Looks ok to me.

after i made this setting on my forum , my forums members are complaining about slow and stuke ,

when i removed it yesterday , members are happy now

!!

RR's add little to no load at all. It shouldn't be remotely noticeable.
If adding in something this small causes your site to lock up, you have serious other underlying issues to investigate on your server