my browser or what is this? The last posting from your IP was less than 360 seco

[antony]

"An Error Has Occurred!
The last posting from your IP was less than 360 seconds ago. Please try again later. "

i often get this error when I am just trying to search here. Not sending PM , not posting, just searching.

this thread suggest there is limit on posting. https://bitcointalk.org/index.php?topic=100009
Is search considered as a post? Or is it because of hitting back button or so? 

I am a bit puzzled here and hope simple search is not rate limited. If it is rate limited then 6 minutes sounds a bit extreme. 2-5 searches per minutes would be nicer.
 
Or do i need a proof work to search too:)

-a