My Vanilla Forum run too slow.. any help or suggestion please

edited November 2010 in Vanilla 2.0 - 2.8
I am a new user in Vanilla forum and I started pics and clips media website, www.hahasomuch.com/Vanilla/ Weirdly my forums run extremely slow, sometimes it gets totally fine, but it happens again and again. Could anyone help me what I am doing wrong..? I am using new macbook, and..
I have many plugins
Analytics, adsense, fileattachment, jixbar, Gravatar
HtmLawed
HTMLPurifier
ImageResizer
Magic
Minify
Following
Signatures
Sitemaps
Tagging
Twitter Feeds
CLEditor jQuery WYSIWYG
Voting

I am using default for my theme... I have no idea, why sometimes forum runs fast and sometimes runs extremly slow.. I have not made changes, but I have uploaded many posts.. everyday I upload about 10-15 posts..

I have tested "readme.html" in my server, it runs extremely fast, so what's my forum's problem, running so slow..?
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