I downloaded and installed the halloween Edition Beta1 this afternoon and gave it a whirl. I am happy to report that it totally removes the "slow loading" issue: the initial progress bar appears on my 1.7 GHz P4 in around 4 sec now instead of more than 4 min(!) before. The scans are significantly faster than in 1.5.1.15 and even somewhat faster than in 1.4 All this is excellent.
One comment, however: I had some trouble turning off the "usage trace" scanning. It would be nice if this feature could be made more prominent. I do not want such because I manage cookies using CCleaner and having to deal with cookies selectively in more than one place (browser, CCleaner, SSD, ...) is a pain.
The shredder option in the context menus is an interesting touch. However, this should be made optional: make an option parallel to those for TeaTimer,
selected perhaps in the installer and/or in the SSD settings menu. Again this is a feature I personally do not need since I have SecureDelete and Privacy Guardian, both of which already are in the context menu.
Looks like a winner from here! Good work!