I have run Disk Utility and deleted many image files with no improvement in speed. The slow speed came on suddenly. No new programs or devices. Any ideas would be appreciated.
This also happened to me very recently (within the last couple of months).
I used Disk Optimizer (Localizer?) (I forget) to get rid of unused foreign language files; MacJanitor to clean up logs, etc.; dumped any program that I didn't use frequently. Nothing helped.
Slower and slower.
And Firefox wasn't helping matters; it took nearly a minute--or more--for pages to load.
Still, not wanting to lay out the cash for a new computer, I forged on.
Then, the display started shaking on occasion and, then, shrinking and expanding like an accordion on others.
Then, the monitor would just blip, flatline like an ER EKG and go dark. Slapping the eMac on its sides repeatedly would defibrillate it, but I expected that the time would soon be here when defibrillation would be futile.
I hate to say it, but I think you're at the first stages of the eMac slippery slope.
Don't be disheartened, though. It will lead you to buying a new machine, and you will be amazed by how much things have improved since the eMac.