Sorry, I should have mentioned. VWO stands for our product Visual Website Optimizer. We internally prefer VWO over the full name since it is long and it kind of

Sorry, I should have mentioned. VWO stands for our product Visual Website Optimizer. We internally prefer VWO over the full name since it is long and it kind of slipped while I was writing the comment. You are right that we don't have to upgrade to every version but as you say performance improvement is sometimes very significant so we feel compelled to upgrade.