Why is it that so many people on this forum want to lie to themselves to justify their purchases/decisions? I bought GDE because I read that it wasn't too bad with lag/FC but it is terrible. I love how it looks/functions, but come on!! It is not a fun experience after awhile. Sometimes I'll hit the home button to sit at a black screen for up to 10 seconds! Occasional lagging between screens, apps will occasionally disappear from the drawer, the drawer sometimes lags...it gets old after a couple times.
Perhaps the answer to your question is that "many people" haven't had the same experience that you report. Lags are nearly non-existent and I haven't had a single FC over a month or so of using GDE. Hitting the home screen button never fails to execute instantly. No disappearing apps and no lags there either. And I have all seven available screens filled with apps and widgets.
On the other hand, if I had experienced what you claim the first conclusion I would reach is not that "so many people are lying to themselves," but that there is something seriously wrong with the implementation on my individual system.
And for the record, I have no connection at all with the developer. I don't even know offhand who the developer is. Just very satisfied with a stable, highly functional app.