14.04 to 16.04 on older laptop

I've got an old Lenovo Thinkpad that's been ruing 14.04 for a couple years. It does just fine. Not the fastest thing ruing, but totally stable, usable and fast enough.

Any educated ideas on whether upgrading to 16.04 will be okay? Will 16.04 take more to run, be more efficient, neutral? Anyone with experience on the betas with a comparable system?

It's the SL500, 1.9g memory, Intel Core 2 T58702, 2gz x 2, 32-bit, Intel GM45 graphic card.

I'll probably install it in any case, just to see how it runs, unless someone says nooooooo, don't do it!

(My user name is not an indication of a high linux experience level.)