Either multiple runtimes, or if you want to keep just one runtime tree structure, hogwarden's B-Booost program, which lets you create custom folders within the runtime tree. The -only- things that need to be in the root runtime in the actual program and the actual deltas for the INJ system, and the python scripts you use. The only time Poser really looks at your runtime fully is at startup, so a quicky trick is to create a folder called null runtime and put =nothing= into it. Switch to that one before you close Poser, then when you start up again, you will be up in seconds. You will still have the time penalty of Poser reading what library you open after switching to the real runtime, but once its up, it only reads the one you open, so it breaks the time lag into smaller chunks.