For me at least jerboa feels quite jittery when scrolling posts. My guess is that it is having to load from the server and thats why you get those pauses, i am not absolutely sure on that. If true maybe jerboa needs to request more posts at once.
I believe that is in fact the issue. However making larger requests will just cause the issue to happen in a slightly different fashion, that will ensure heavier load. It's largely just a matter of resources that will have to come with hardware upgrades.
Hardware? Do you mean server hardware or device hardware? Because the device is fast enough. It just feels like jerboa is only loading like 20 posts at a time and keeping no cache of them