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@datguygamer
@optimuspig I employ the method I have always used for upgrades. The first few upgrades are quick and can be done in 1 day. Thus, I do them and wait for them to get done. Then I use my materials and coins to upgrade the rest but then skip the process with gems. This saves gems in the long run as skipping the time costs less gems than directly upgrading with gems. And there you go. I have been playing for a long time and I have resources to boot (except for sparks) and so I always use this method to minimize my gem expenditure while maximizing my upgrade output..