apple leopard upgrade tiger

Apple iBook G4 1.07 Ghz 512 MB of RAM running Tiger worth upgrading to Leopard?
I think that works well with my iBook that I use to surf the web, instant messaging, listening to music remotely from my Intel iMac with Leopard, the operation of Microsoft Office. I heard that Leopard improves the performance of format Mac Power PC, it is true, i can benefit from an upgrade? Thanks
Personally, I think Leopard would be more of a pig when it comes to be a computer because it is newer and designed for new / faster computers. His cell phone rings a little slower than mine (1.6GHz processor here) and I can not even move just slow down to turn the Internet (although Windows XP, Linux, do not have these problems.) Personally, I think you should stick to Tiger, Leopard and get a new laptop.
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