HTC Desire running slow

Just this afternoon my HTC desire has decided to have a delay when Scrolling and generally moving around the phone.

The last thing I used it for was when a work colleague wanted to bluetooth an image he had taken (so not an image from a PC) to mine, I then used the usb cable to transfer the image to my work PC.

Even after this it didn't seem that slow and I had only used it after this time to send a text.

I have juice defender and advance task manager running in the background but these have been there for a while before now.


I unistalled the last app I downloaded (android light sabre ) and this has made no difference

Any thoughts?