No idea about Oppo phones.
My J5 takes 1 second to load the app and one to two more seconds usually to load the updates on Facebook, but I use mostly via UC browser (it even supports Facebook push notifications). Facebook and messenger app are heavy and takes ~150 mb ram all the time (even in background), so I don't use them.
WhatsApp is very light and takes one second maximum to load.
Maybe your phone is running out of ram. Just keep the phone firmware and apps updated and disable/uninstall the unnecessary apps. it will get better.
Exactly. Motorola are awesome phones.
I tested their 1GB ram Moto E 4G (2nd Gen) too for a short time, a ~$120 phone. It had USB OTG support, auto brightness sensor, noise cancellation mic, moto display (glance notifications), Gorilla Glass, 245 ppi display. It even played Asphalt 8 Airborne very well and I have never seen a 1GB ram phones running that fast, even in multitasking and heavy use. Some of the feature mentioned above are even missing in Galaxy J5 and J7.
@altisdualvvti
Interesting, isn't it?