I have tried latest Kubuntu 20.04 & now KDE Neon’s latest build.. On fresh install, it seems very fast but as soon as I start doing real work on it, like opening firefox with more than 5-6 tabs while editing on LibreOffice alongside running Discover to install packages/updates, it starts slowing down.. Even minimizing maximizing start stuttering like crazy. Opening a new tab on firefox would lag, opening an app means a freeze in pointer for a good 2-3 secs (literally).. And very soon, system starts freezing completely leading to an almost unusable state..