I have an iMac G5 OS 10.4.11  OS 9 is also installed.  Can I remove OS 9 safely?  Will this help my speed?

Two questions -
I have an iMac G5 with OS 10.4.11.  OS 9 is also on the computer.  Can I safely remove OS 9?  Will removing it help my processing speed?

If you remove OS 9, all Classic applications will fail to run, as shown by the System Profiler in the Applications or Applications -> Utilities folder:
Not running Classic will speed Mac OS X application speed, but you needn't remove the system folder, or the Applications Mac OS 9 folder.  You just need to make sure Classic is not running in Apple menu -> System Preferences -> Classic, and is shut down if it is running.  Removing the System Folder with the Finder and System files and the Control Panels folder will disable Classic as well.   I would only do so, if you are sure oyu never need a Classic application again.
Upgrading to Mac OS X 10.5 will stop you from being able to use Classic in any case.

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