App is slow on mobile devices with slow internet

[JesJehle]

• Map Images load incomplete
• Scrolling on Inventury list lags
• Changing map lags

ToDos:

I would solve the following problems as a first shot:

• Add a context variable to paginate through the inventory list, or to set limits. #83
• Implement a Infinite Scroller in the list to render only a few list items.

[mmaelicke]

• Map Images load incomplete

There is nothing we can do about this, as this is the WMS being slow. A possible approach is to get the current speed from capacitor and treat the application as offline, if the connection gets too slow. Then we serve the inaccurate images from the offline storage

• Scrolling on Inventury list lags

Ionic also has an infinite scroller. We can implement that, but that is a bit of work as we need pagination in the context. There is no easy fix for this.

[mmaelicke]

capacitor's Network plugin can only report on the type of connection (wifi, cellular, none), but we can use something like this: https://github.com/branchard/fast-speedtest-api

Then, then offiline context could set itself offline when the internet connection speed drops too much.

[JesJehle]

Analyzing the application with lighthouse plugin shows poor results but some starting points for performance improvements.
@mmaelicke this is better addressed by you.