The short answer is yes, and there are tools to help you. There are ways to simulate a poor network in the dev tools of major browsers, in the Android emulator,

The short answer is yes, and there are tools to help you. There are ways to simulate a poor network in the dev tools of major browsers, in the Android emulator, there is "Augmented Traffic Control" by Facebook, "Network Link Conditioner" by Apple and probably many others. It is telling that tech giants make tools to test their software in poor networking conditions. It may not look like they care, until you try software by those who really don't care.