Tune Oracle Database for faster startup (flashback)

Question

I'm using Oracle Database 11.2. I have a scenario where I issue FLASHBACK DATABASE quite often. It seems that a FLASHBACK DATABASE cycle does a reboot of the database instance which takes approx. 7 seconds on my setup.

Database is small (~ 1 GB tablespace), all files should be in I/O caches/buffers. Therefore I think that the bottleneck is not I/O based.

I'm looking for tuning advices in order to save user time and/or CPU time for doing a flashback.

UPDATE:

Flashback sequence (and timing of each step) is the following:

1. Get SYSDBA connection with prelim_auth=true [15 ms]

2. SHUTDOWN ABORT; [1034 ms]

3. STARTUP (unrestricted) [1241 ms]

4. Close SYSDBA connection [2 ms]

5. Get SYSDBA connection with prelim_auth=false [18 ms]

6. ALTER DATABASE MOUNT [4073 ms]

7. FLASHBACK DATABASE TO RESTORE POINT <restore_point_name> [306 ms]

8. ALTER DATABASE OPEN RESETLOGS [1652 ms]

9. CLOSE SYSDBA connection [2 ms]