System 7.5.5 is a great system, but it's not a very good choice for that Mac. The best way to remedy this is to get more RAM, as 8MB is paltry for even a 68k Mac.
I personally like 8.1 and 8.6 on early PowerMacs, but as porter said, 7.6.1 is the best choice for System 7 on the PowerMac.
If you really must stay at 8MB, I'd recommend uninstalling RAM Doubler and using Virtual Memory instead; I assume you can afford the hard disk space. Pump it to 16 or 32MB of virtual memory.
Then go through your Extensions and Control Panels folder and prune everything you don't need. That should get you down to about 4 or 5MB just to boot, and then you can swap that out to disk with VM when you want to run a big application.
System 7.5 wasn't known for great stability on the PowerMacs, especially those with PCI, but it shouldn't be randomly freezing for no good reason.
I have some random 8 or 16MB PowerMac DIMMs laying about; I could send you a few if you like, just kick in a few bucks for postage and a padded envelope.
I personally like 8.1 and 8.6 on early PowerMacs, but as porter said, 7.6.1 is the best choice for System 7 on the PowerMac.
If you really must stay at 8MB, I'd recommend uninstalling RAM Doubler and using Virtual Memory instead; I assume you can afford the hard disk space. Pump it to 16 or 32MB of virtual memory.
Then go through your Extensions and Control Panels folder and prune everything you don't need. That should get you down to about 4 or 5MB just to boot, and then you can swap that out to disk with VM when you want to run a big application.
System 7.5 wasn't known for great stability on the PowerMacs, especially those with PCI, but it shouldn't be randomly freezing for no good reason.
I have some random 8 or 16MB PowerMac DIMMs laying about; I could send you a few if you like, just kick in a few bucks for postage and a padded envelope.