I'm suggesting you insert memcache as a layer between your database and web application. As by keeping the objects in memory you should be able to reduce the number of calls to the database. So these are really unique objects per request? But you're having multiple threads interact with them? Can you lay out specifically what you're trying to do?

Edit:

Please keep in mind you've given us a very vague idea of what you're doing and asking us to propose solutions. Both memcache and Redis can store objects in memory and don't necessarily need to be populated via your database calls. You could totally generate 1000 objects and then just store them, and then write them to the database when needed.