I had an issue in December 2022. A Moshi Moshi eSIM from Airalo was my first experience, and it was terrible. I contacted Airalo customer service, and they refunded my eSIM and reset it for use again. I have noticed that Airalo in Japan isn't quite as good as other countries. If you look at the details, it says yes for IP Routing. I think the Japan eSIM from Airalo routes its data through Singapore, which can affect speeds, especially if you're trying to access local websites. Even if you're going to US websites, there are extra hops that can reduce performance.