by Daniel Kaminski » Fri Dec 28, 2012 8:01 pm
please check again in Version 5.3 7832 - Gaussian Blur has been fixed (should be)
Currently we are not aware of any other FX Combination that would not work correctly. If you find one please let us know so that we can fix it. Mix = 0 means that the FX should not alter the image in any way. If it does it is a bug.
The amount of FX on a layer do not matter to the render engine, only the used FX matter.
Some FX are very resource hungry like render history or any kind of Blur FX, others need nearly no resources at all (most of the Color FX).
Regarding changing the FX to be part of the container instead of the layer:
I think it is still on the feature which list, but I am pretty sure that it will not change in any of the next releases, mainly because booth versions have been discussed and it has been decided that this version is the way to go for the moment.
This does not mean that it will stay like this forever, and sometimes things change faster than expected.
Daniel
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Daniel Kaminski
Pandoras Box Expert