I see other people are having this same issue and nobody seems to have any concrete answers. I am getting tired of the 10 or sometimes up to 30 seconds it takes to return to the home screen after closing out of a text message or using an app. My screen is blank and I cannot do anything in that time frame. My main home screen is filled with shortcut widgets but the other 3 screens are not filled up completely. Actually I removed a bunch off those screens thinking it would speed things up. Now I will say I have been having an ongoing issue with the LOW PHONE SPACE, and TEXT MESSAGE MEMORY FULL notifications popping up. I am still trying to figure out what is eating up so much space but I think I may have figured something out the other day. I noticed I had my K-9 Email set to store messages on the phone. I used a Cache Cleaner and cleared the phone's cache completely. When I opened K-9 again, I had to set it up completely from scratch and saw where I can set the storage to the SD card. So far so good and haven't been getting those notifications but that doesn't explain the delay getting the home screen back up though.