Hi Tejas,
1. Your network bandwidth is very good (2G not recommended, To be on 3G/4G or wifi):3G/4G and WIfi
2. Response time of your server is good.:Yes
3. Are you connected to any VPN from mobile ?No
4. Also provide your architecture.(central hub or embedded):Hub
5. Try to run the same from google chrome from your smartphone rather than fiori client and see the performance.:Its good in Browser
6. By only Windows and IOS devices, do you mean it works good in android ? (Not sure if you have deployed same client for android too):Means we are using only IOS and Windows devices but we have checked in Andriod also but same results.
Regards,
Trilochan