What could make a A135-S4478 slowdown in relatively short time period

Alrighty, Had this thing a good while now guessing over a year since I paid off the debt from it.
This has by far been one of my best laptops - I run a home based business as a programmer and am pretty hard on these things(I.E. constantly on and about 10 hours of usage a day)
The only problem I have experience is about 2 months ago I had one of the ram slots dumped on me so I bought a 2 gig chip and took the 2 1 gig chips out.
As of late within the last month I have notice a HUGE slowdown that is beyond annoying at this point. Its not just browser but outlook and my IDE(development enviroment), quicken just about anything...can take forever to paint or take input sometimes during its normal run. Network seems fine as its not the data that takes so long on say IE its more that it can't keep up with the processing needed to paint the page fast enough.
I run norton 360 as I have for quite a while and so don't think its spyware/malware/virus at this point. Harddrives aren't defragmented. All seems alirght in computer land as far as I know.....
What could be going on here????

Hi,
From which manufacturer is this newly purchased and installed memory module? Do you know the timings and the FSB speed from it? Maybe the old modules were a little bit speedier which could easily explain the "slow-down". It´s the same with notebook harddrives: the differences are slightly but as someone which works the whole day with his workstation you will relatively quick recognize how the performance differs...
Greets

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