My ~/Library/Cache folder is only 5GB which seems much more sane, though this obviously depends on the apps one uses. You also seem to have had an excessive amount of caches, which probably was caused by some misbehaving app. My best guess is that some cache got corrupted and cause macOS (or some app) to misbehave. Well written apps usually run these kind of activities in the background, on another app thread, to avoid blocking the user from doing other stuff. But it could also be that the app is waiting for some other reason, perhaps for data from the network. The most common cause for this is a lot of Virtual Memory swapping (High Memory Pressure in Activity Monitor). The spinning wheel of death appears if the current app hasn't responded to user input for 2+ seconds. The amount of cache shouldn't really affect your performance.
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