Updated my HTC Desire to Android 4.2.2 Jelly Bean today.
It didn't take much effort, it was very smooth flashing the ROM.
Here's a video of it running smoothly.
I bought the HTC Desire 3 years ago, but I didn't think it will run Android 4.2.2 this smooth. The ROM I used is called Slim VJ 2.0. Enjoy the video!