A quick update with my scene
i deleted all the forest objects and the forest templates, didnt touch the heavy collapsed RC objects and anything else, rebuild the new forest objects again and rendered, the timings jumped down to 1hr 20 mins, so i am feeling a bit relaxed now
I have no idea whatsoever was causing the problem, but it got solved
Thanks for the help once again.
Now a quick question, can i apply an overall forest gradient color to the grass preset or should i have to optimize the grass preset and then to individual map slot i have to change the diffuse color slot which has forest color already applied to it...
Thanks in advance