Optimizing Radeon HD 5450

I built my system in mid 2010 so it's like 6 years old but I'm still satisfied with the general performance of my hardware (GA P55A UD3P + core i5 750@stock cpu and voltage + 8 GB DDR3 + Samsung SSD 500 GB on SATA2 + Windows 7 x64) except, possibly my graphics board which is a fanless Radeon HD 5450.

My main issue is when browsing the internet via firefox (main browser), I've always noticed lagginess/slowness of rendering of web pages. This is with different versions of that browser and not just 1 particualr version. i.e. Rendering pages is not fluid or smooth, feels laggy and also videos sometimes flick randomly whether they are videos on facebook or youtube. I use the latest official driver 15.7.1 and I can't update to newer versions as AMD dropped support for the 5xxx series

My question is: Is there any tweaked/modded driver version of 15.7.1 that can squeeze the maximum perfromance of this card for better browsing and video playback? (P.S. I don't play games)

If this card represents a real bottle neck in my machine, will I get away with buying this card? i.e. will I see a nice difference if I swapped my card with the newer one? or it's just a waste of money as long as I don't do games? (Unfortunately, I'll have to wait for some months until I travel myself and get this card as it is not sold in my country & I can't have it shipped either)

Many thanks in advance for your feedback.

I own this card. Actually, my 4 year old owns this card. I opted for a Sapphire 7770 on the old system (which my wife now owns) and all I can say is that I'm glad I did. There are likely a few tweaks out there for a 5450 but to be honest I don't think it's worth the effort. Sooner or later you'll be wanting a better card regardless of what you do with it and that is why it is in my 4 year old's Dell duo core. :)