Okay finally the correct version topic and not 6.71B1.
I changed the server setting to disable XFeatures and restarted. No change as everything remains lagged, loading the headers is fine but processing the group is very slow and in turn all other navigation is almost frozen. For example if I click on Options nothing happens for 3 - 5 seconds, (sometimes longer), or I want to click on another group to load the latest headers once again the program lags. Switching to other programs all seem to be fine, (except when Newsbin is Unraring and then historically it slows the system down).
Wondering if I should roll back to the 6.70 version unless you have other suggestions.