The initial releases of iOS 11 and iOS 12 were not good for Suica performance. It was 3 months of teething problems. iOS 11 didn’t settle down until iOS 11.3 and iOS 12 was a mess until Apple fixed everything spectacularly in iOS 12.3, which also saw the debut of EMV Express Transit.
iOS 13 has a reputation of being buggier than previous iOS releases. However, I am very happy to report that Apple Pay Suica performance on iOS 13 and 13.1 is far superior to iOS 11 or iOS 12. Apple did a lot of work on Wallet performance in preparation for iOS 12.4 Apple Card, and general Suica performance has held the line and even gained a little in iOS 13.1. This is great news for Apple Pay Suica users: everyone can safely upgrade and use iOS 13.1 Suica.
Two very minor UI rough edges remain:
- Commute Plan expiration notifications don’t work at all.
- Missing text on the Suica card UI when the iPhone Language setting is Australian English. You can work around this ‘Bad Aussie Suica’ issue by using another English language setting.
Bad Aussie Suica: ‘Add Money’ text can disappears in Australian English language setting 
Bad Aussie Suica: ‘Add’ text disappears in Australian English language setting 
Bad Aussie Suica
I managed to put together a quick video showing iOS 13.1 performance on iPhone 11 Pro and hope to post a higher quality version soon.
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