The size should not matter. It is however not saved packed as SER has to read that file in 1MB matches and packing would then require it to save in 1MB packets. I think thats just a waste of time and resources as it also would become slower. However do you get any bugreport window when importing and it freezes?
@Sven yes. I just checked and the file is created about 320mb atm so in 9 hours it imported only 320mb of 4.5gb i am going to write a c# file to remove duplicate, randomize and split into 500mb GSA ser seems like extremely slow
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It imports really fast that way
However i believe if you choose randomize very big file gsa fails
Also randomizing this file took quite a while at my monster computer (8 cores, 4.5GHZ, 32gb ram, 2x ssd raid 0)
My ram got fulled probably also used pagefile