Safari webpage preview question

Hi folks,
if i search my history of visited sites in the cache of Safari, it often does only show a grey Safari Icon on black background.
Why is that?
For the most site's i became a Preview (they are stored in the following path /Users/tUSERNAME/Library/Caches/com.apple.Safari/Webpage Previews)
Could it be possible that safari does only stored a preview when the site isn't secured (https) and only if the site has non additional parameters in the url like
http://anysite/query_B1.cfm?itis=B0343551%20%20%20%20%20%20%20%20%20%20%20%20%7C 373%7Cwhite%7Ceeeeee?
Thanks in Advance

Well, I disabled safari webpage preview in preferences, and rebooted, zapping the pram and it hasn't restarted, and I haven't had the high fan / hot running so yay!

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