I 'upgraded' my Sony Ericsson Xperia Arc S to ICS, and it's absolutely ridiculously bad. I blame Sony for most issues, but the fact is ICS is bigger and uses way too much space for older devices that sold with none. I imagine JB even more so.
On my HP Touchpad though, Jellybean runs like a charm. I think the real reason fragmentation was ever an issue is because so many devices shipped without enough space for apps.
It doesn't help of course that Google and their strategic app partners (see Facebook) assume that every device has a tonne of space (which modern devices do of course) and grow ridiculously big. Chrome and Currents are both unusably big on an older device.
Bit of a ramble, but in short you're getting a much much better experience by not upgrading, unless there's a way to hack that tiny storage partition?
On my HP Touchpad though, Jellybean runs like a charm. I think the real reason fragmentation was ever an issue is because so many devices shipped without enough space for apps.
It doesn't help of course that Google and their strategic app partners (see Facebook) assume that every device has a tonne of space (which modern devices do of course) and grow ridiculously big. Chrome and Currents are both unusably big on an older device.
Bit of a ramble, but in short you're getting a much much better experience by not upgrading, unless there's a way to hack that tiny storage partition?