@edvin yeah I don't know the details but I understand Windows 10 was made very lean. Regarding screencasts some of those thoughts did occur to me afterwards. In hindsight at that moment I wished I just moved the Subscription to closure for Label rather than saving a reference to the variable. I'm going to plan my next one better as this one was an almost improvised dry run. I think that is an awesome idea to build off each others' screencasts.