You'll be able to find more detailed specs in Apple System Profiler. This should be under your apple menu.
If you're running any version of OS8 I'd say turn Virtual Memory off. For OS9...I dunno... set it at 256MB or so. You've probably got a 4GB hard drive in that unless it was upgraded, so setting the VM really high will just waste drive space.
The easiest processor upgrade for your iMac is to grab a 333MHz processor out of a later iMac. Like Bunsen said grab one from a trayloader. I'd try and max the RAM out too. Some of those early iMacs are compatible with two 256MB sticks but it's safer to get two 128's...better to stick with something that is known to work. I tried two 256 sticks in mine and it only sees a total of 256.
If you're running any version of OS8 I'd say turn Virtual Memory off. For OS9...I dunno... set it at 256MB or so. You've probably got a 4GB hard drive in that unless it was upgraded, so setting the VM really high will just waste drive space.
The easiest processor upgrade for your iMac is to grab a 333MHz processor out of a later iMac. Like Bunsen said grab one from a trayloader. I'd try and max the RAM out too. Some of those early iMacs are compatible with two 256MB sticks but it's safer to get two 128's...better to stick with something that is known to work. I tried two 256 sticks in mine and it only sees a total of 256.