I wouldn't really enjoy having to wait multiple seconds for the keyboard to open. I get frustrated when this sometimes happens on my Jolla phone for whatever reason, not really because I'm in such a hurry but because a phone shouldn't struggle with one of the only two things it's supposed to do right. The keyboard and the messaging application should probably be held in memory at all times, like the calling application. Of course, with only 1GB RAM, this wouldn't leave a lot of options for other applications to run concurrently. Looking it up, the iPhone 4S apparently only had 512 MB RAM, so it does seem to work alright.