Our family went through the same thing with a budget Celeron "MDG" computer running Windows 98. Awful. Keep in mind that, like you, I had previously used a IIsi and an LC630, so I figured... 300MHz, must be amazing?!?

At some point later, my high school had surplus Powermac 7500/100s that were gifted from Nortel and I managed to snag one, paired it with a USR 56k external modem and it was a million times better than that Celeron econobox.