When clicking "Magage application" from kicker context menu, discover takes a really long time (1 minute here) to display the application. It seems that it doesn't do it until it's done checking for updates, which can take a long time.
Cannot reproduce with git master on Neon or 5.12.6 on Kubuntu 18.04. It's near-instant for me on these systems.
It depends on which backends and providers you have installed (in my case, the offending one is the knsrc from kalzium). The issue is not how long it takes, but the fact that nothing is displayed until the check for updates is finished for all backends (which may potentially take a long time).
Git commit fb9320ae8b37182fae91bf31757fada44329b529 by Aleix Pol. Committed on 20/09/2018 at 11:00. Pushed by apol into branch 'Plasma/5.14'. Don't wait for all backends to be initialized to trigger a query Backends should be smart enough to take the query regardless of their state. M +3 -3 discover/DiscoverObject.cpp https://commits.kde.org/discover/fb9320ae8b37182fae91bf31757fada44329b529