You always get that no matter

Imagine 5 devices that all push at 100mbit in 100 milliseconds (1gig linerate) to the target 1gig connected device, then nothing for 900ms.

On paper they are feeding 100mbit a second each to a target receiving 500mbit a second. Easily fits in a 1gig link.

But because of the timing you've got to transmit 500mbit in 100ms, or a peak speed of 5gbit.

So instead you have to buffer and delay the packets. Your near-zero latency increases to 400ms, and your switch needs about 400mbit (50MB) of buffer, or over 30,000 packets of buffer space.

You'd need a very high end switch to avoid any drops in that situation.