I'd only max-out RAM to about 500MB - the rest is fine to run os9 ...
And this my favorite/basic os9 install to make the iMac-G3 a nice connected workstation:
https://forums.macrumors.com/attachments/g3-workstation-jpg.768470/
1) Basic Web/IMAP-mail: Classilla
(then connect to the internet and go to macintoshgarden to find the rest)
2) Upgrade to os 9.2x
3) webDAV: Goliath1.x (to exchange files through cloud/webDAV)
4) FileSharing (AFP): Transmit1.7, Fetch4 (FTP only with OSX-10.5 or earlier or OSX-10.5-Server as a virutual machine within VMware Fusion)
5) File handling: StuffIt5.5 (to expand archives), Toast5 (to mount disk-image-files)
6) Office: MS Office '98 or '01; AppleWorks6, NisusWriter
7) PDF: Acrobat5, AcrobatReader5, PDFWriter4
8) ScreenSharing (VNC): VNCthing
9) VirtualWindows: VirtualPC 3-6 with WindowsXP-SP2-Fundamentals with RDP-Client-6x to connect to Windows-Machines up to Server2008; or Win2k to run some critical Windows-Progs
10) Graphic: AppleWorks6; Photoshop7
etc etc ...
Get connected:
- ScreenSharing with all your Macs (VNCthing) or PC (virtual WinXP/RDP-Client)
- Move files between os9 and Macs/PC via IMAP-email (Classilla) or webDAV (Goliath)
Get productive on os9 with any legacy app, then print to PDF (Chooser: Adobe PDFwriter4 etc) and share the PDF to any other machine via webDAV/email.