N7Long polling, SSE and WebSockets

The problem

1 s on screen = 150 ms

How does a chat app show a message the instant it's sent?

Keep asking

Forty users want news that comes about once a second. Each asks the server for it four times a second.

Ask every250 ms

Live metrics for each version of the scene
Polling	Push	Change
—	—	—
0%	0%	—
—	—	—
0	0	—

N7Long polling, SSE and WebSockets

When the server has news, the client either keeps asking or keeps a line open.