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@sumitarora15
Yes specially in the Medium Portals but at that time it hardly used to matter because the amount needed to upgrade the transformers was a bit low eg 40 or so but now I need 60 of them to upgrade it!!
Currently @R372 with just 5 transformers @L12 and rest all @L13, and the problem has actually started because the amount of materials needed for them are quite high which will affect my average of 2 transformers a day to 1 transformers upgrade a day!!