I would say, No. This does not describe it. Lite uses a different desktop environment that is not as Resource Intensive as Core.
Core is formulated (With Gnome) to launch apps based on productivity - much like preload. This includes having apps run in the background in anticipation of you launching it - or running prep scripts.
XFCE does not load an app in anticipation of you launching it. It only loads it if you launch it.
This makes XFCE less resource hungry than Gnome. For most apps on XFCE, they should still launch quite quickly. But some heavy apps will launch more slowly on XFCE than on Gnome, since the full app must be initialized.
Due to XFCE being lightweight though, on a new system with lots of RAM and a fast processor, XFCE would launch even the heaviest apps as quickly if not quicker than Gnome, since Gnome is also running other 'high demand" apps in the background and XFCE is not.
XFCE is not just for old computers.