I've been putting Roms on my Motorola Droid for about a year now. For each iteration, the primary reason I would go on to another ROM is because the previous ROM would become slow over time. Whether it was MIUI, SS, or CM, it didn't matter. When I would first put it on, my phone was great; but after a little while using the ROM, the phone would be slower than molasses, no matter how much I would overclock it.
What's going on with the Phone that would make the phone slow down like this? Do others experience this phenomenon?