slow frame rate

[vicer1234]

Hi,
I tried to implement the water ripple effect using the image manipulation similar to shown in link
The strange thing in it is, when i use a large image like 800X600 or 1024X768 etc the processing becomes very slow.

It happens like its consuming lot of CPU!!! but I dont get the idea why is it happening since the CPU can handle good amount of
calculations at a time. If the pixels numbers are like 1024*768 = 786432 then also it can process it faster!!!!
Then why is it very slow in rendering??

All suggestions are welcome

[Laurent]

How are we supposed to tell you why your code is slow, if we can't see it?

And by the way, pixel shaders provide a much faster solution for this kind of effect.

[Groogy]

I would also propose pixel shaders so that it is done on the GPU instead, it's pretty much made to do heavy calculations fast.