The new update now brings my browser to its knees when upgrading more than one level in coilworks an makes it unplayable now because one max purchase takes minute(s) to be "calculated". I'm guessing it has to do with the changed save behaviour.
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Thanks for the report, you found a real one and it's now fixed for the next update. Good news first: it isn't the save system, and the save fix from the last update is working, so nothing you buy is being lost.
What actually happens is that a Max purchase buys levels one at a time, and the game was redrawing the entire upgrade list after every single level. The last update also made milestone Scrap scale up at higher Voltages, so a Max purchase can now be thousands of levels in one tap. Thousands of levels times a full redraw each is what locks up the tab.
The fix makes the screen redraw once per purchase instead of once per level, which brings Max back to well under a second. Until the update lands, the x50 multiplier works without the freeze.