I believe that each new update takes up more space. When my G1 was upgraded to Cupcake, it started slowing down. What I did was I uninstalled a number of apps

I believe that each new update takes up more space. When my G1 was upgraded to Cupcake, it started slowing down. What I did was I uninstalled a number of apps and deleted a number of photos and my G1 was snappy again.