January 13, GSMarena iPhone 6S / 7/8 upgrade fixes before and after the update compared the performance, the results are as follows.
iPhone 8 Plus before and after the upgrade
After upgrading from iOS 11.1.2 to 11.2.2, the run of the A11 chip dropped about 0.5%.
iPhone 7 before and after the upgrade
A11 Bunny in the safety of running points after the upgrade actually rose 3%
iPhone 6s before and after the upgrade
A9 chip performance in Ann Bunny decreased by 12%
The reason why this issue attracts attention because, after the Dutch site Melvin Mughal measured,iPhone 6's A8 chip after upgrading iOS 11.2.2, the performance running cent plunged as much as 41%.
From this test alone, the A10 / A11 negligible performance penalty after fixing the vulnerability, but the older A9 / A8 does not seem optimistic.