I don't know if people know about this but this phone has a weird way of keeping its performance fairly OK.
What I'm saying is that if you have this phone (OT Fierce) and you notice it slows down after a few months of using it is highly likely that the problems is with your storage.
Yes, if you have not used a SD card in this device through those months you will notice the slowing of, well everything.
I dont know why this happens but yeah delete or move apps off your Internal Storage to and SD card and the old fierce performance will be back. Around 500MB or 200MB will do. Just keep the internal storage has enough space and you'll do fine.