i used this parameters with ab
ab -k -n 80000 -c 500
ab -k -n 100000 -c 320
i thinking about double caching with varnish . but when i switch to varnish we got default cpanel page and still working on .
but now i need a little more speed on static content and also in 'internal wordpress pages' that redirect requests with htaccess . i tested private cache in htaccess before and we still get slow pages in wordpress except index . index page load exteremely fast !