subscription slow in RN, but not on web app

[JulianKingman]

OK, bear with me; I am retrieving a collection of 10,000 docs, which I realize is a lot, but I'm trying to see if I can get it to work acceptably.

In the web interface, my subscription loads and is ready in 2-12 seconds, depending when I start counting (page load or subscription start/end time, page load being relevant because SSR passes the initial docs). This is acceptable.

On the mobile device, subscriptions take 30-70 seconds, which is obviously way too long.

Any ideas what might be causing this, or where to look? Some notes:

• I initially thought it was the offline package I've been working on, but that actually speeds it up (it inserts cached docs to minimongo, which presumably then difs and merges skipping some docs).
• I also practically ruled out the DOM, as for my test I just have a Text component listing the subscription status.
• Possibly related to this issue, but it seems like it shouldn't be taking this long anyway: https://github.com/meteor/meteor/issues/7649

[bockc]

I have a similar issue. My dataset only contains a few documents (less than 100). In my web app the subscription takes 0.011s according to mongo-cli but in my mobile app it takes up to 10s. Any other subscription even with a larger dataset goes faster.

Any idea ?

Update: I recently found out that this only occurs when Debug JS Remotely is activated. A workaround is just not to activate it and debug via react-native log-android or react-native log-ios. Still, I prefer to debug in the browser console for comfort so if anyone got a clue to avoid this performance issue it would be greatly appreciated.