I notice that when i use IS EXIST, slow me that element exist even it is shown on website or not, even if i check special box to check if elelement exist on web page
That checkbox means "SHOW or HIDE" additional settings, it does not mean
"ACTIVATE or DEACTIVATE" additional settings. Its like "+" - EXPAND and "-" - HIDE.
If anyone has this problem add a HTTP client reset at the beginning of your script. HTTP client seems to get clogged at a certain point. Issue resolved.