Do you even know what a frontend/client is vs a backend?
The frontend is anything but java (the website uses javascript, they have mobile apps, not sure what they are written in, but besides android having a few necessary wrappers, these are also not java applications).
You don’t see the backend and they do different things between different services so not much point in comparing them - that’s a huge, complex, partially cached-at-your-ISP even network infrastructure.
Besides, Java itself is very fast and is itself no reason for an applications’ (especially network-related) bad performance. It literally runs like half of the internet, with basically every other top 100 IT companies having business-critical infrastructure dependent on it.
The frontend is anything but java (the website uses javascript, they have mobile apps, not sure what they are written in, but besides android having a few necessary wrappers, these are also not java applications).
You don’t see the backend and they do different things between different services so not much point in comparing them - that’s a huge, complex, partially cached-at-your-ISP even network infrastructure.
Besides, Java itself is very fast and is itself no reason for an applications’ (especially network-related) bad performance. It literally runs like half of the internet, with basically every other top 100 IT companies having business-critical infrastructure dependent on it.