Utilizing TBB version 3.6.2, it is slow or one is unable to open many sites including this site (https://tor.stackexchange.com). Anybody else have similar problem? Any solution?
A helpful hint by Jens Kubieziel has helped to solve this problem. Since one will get new guard nodes if one unpack TBB to a new directory, there is a chance that new guards are slower than old guards. If the problem is significant enough to slow the browsing operation to a nil, one might decide to unpack the package to a new location again or use the old guards if one see fit and/or change the slow guards in any appropriate way to get a reasonable speed. The only thing is one should be careful that slow speed might be a trick by an adversary to encourage one to change the guards.