Whining is not effective.
How are you measuring this?
Tens of thousands of users run Aperture without this problem.
If you are interested in resolving your problem, you need to provide more information: Library size, number of Images, free space on system drive, system specs, what you done to trouble-shoot, what happened, etc.
Nothing but volunteers here. Help us (and you and others) out by being polite, focussed, and informative.